Smartlet One

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Wear a Smartwatch with Your Longines | Smartlet

Brand compatibility guide
Longines

Wear a smartwatch
with your Longines

Smartlet One is compatible with all Longines HydroConquest, Spirit, and Record references using 20mm to 22mm lug widths, natively supported with no adapter. Installation uses the standard spring-bar system - no modification to the watch, fully reversible in seconds.

Longines has been making watches continuously since 1832, longer than any other Swiss brand with the same name. The HydroConquest is a serious dive watch at accessible pricing. The Spirit revisits the aviation instrument watch with COSC-certified movements. Longines occupies a precise position in Swiss watchmaking - genuine quality without the prestige premium. Smartlet One fits without adapters and removes without tools.
216+References
18mm / 19mm / 20mm / 21mm / 22mmLug widths
18mm→24mmSmartlet range
BrandLongines
OriginSwitzerland
Founded1832
Lug widths18mm / 19mm / 20mm / 21mm / 22mm / 23mm
References216+
How it works

Three steps to both watches on one wrist

01
Choose your strap
Smartlet One is your new strap. It replaces the original bracelet or strap on your Rolex using the same spring-bar system. Lug widths 20mm / 21mm are all natively supported.
02
Clip in your watch
Attach the Smartlet strap to your Rolex by fitting the spring bars into the lugs, exactly as with any standard strap change. No tools required. Fully reversible in seconds.
03
Clip in your smartwatch
Slide your smartwatch into the Smartlet module. It locks onto the strap module on the wrist side of your wrist. All sensors remain fully operational. Both watches run simultaneously.
Model guides

Longines iconic models

Each guide covers all references, variants, lug widths, and step-by-step Smartlet installation for one specific model line.

Compatible
Longines
HydroConquest
Longines's Swiss Made dive watch. At 300m water resistance and available in 39mm to 43mm, the HydroConquest offers genuine dive capability with the finishing quality of a heritage maison.
Case
39mm / 41mm / 43mm
Lug width
18mm / 19mm / 21mm / 22mm
Movement
Cal. L888 / L897
References
30
18mm / 19mm / 21mm / 22mmView full guide →
Full database

Other Longines references

216 references grouped into 33 model families. All compatible. Expand any group to see variants, references, and specifications.

Admiral
19mm / 20mm 6 refs +
Reference Material Dial Lug Smartlet
Admiral 5
Admiral-1966 Stainless Steel Silver 19mm Compatible
Adm5S-1968 Stainless Steel Black 19mm Compatible
Admiral 5-Star
Admiral-2003 Stainless Steel Black 20mm Compatible
Admiral Quartz
Admiral-80Q-1982 Stainless Steel Blue 19mm Compatible
Admiral-80B-1985 Stainless Steel Black 19mm Compatible
L3.614.4.76.6 Stainless Steel Grey 20mm Compatible
Automatic
18mm 1 refs +
Reference Material Dial Lug Smartlet
Cal340-1960 Stainless Steel Silver 18mm Compatible
BigEye
20mm 1 refs +
Reference Material Dial Lug Smartlet
L2.816.4.53.2 Stainless Steel Black 20mm Compatible
Chronograph
18mm / 19mm 16 refs +
Reference Material Dial Lug Smartlet
Chronograph 13ZN
13ZN-1-1936 Stainless Steel Silver 18mm Compatible
13ZN-2-1938 Stainless Steel Black 18mm Compatible
13ZN-S-1939 Stainless Steel Silver Sector 18mm Compatible
13ZN-1939 Stainless Steel Silver 18mm Compatible
13ZN-SN-1940 Stainless Steel White Snail 18mm Compatible
13ZN-FLY-1940 Stainless Steel White 19mm Compatible
13ZN-MIL-1941 Stainless Steel Black Military 19mm Compatible
13ZN-WP-1941 Stainless Steel Silver 19mm Compatible
13ZN-RG-1942 18K Rose Gold Cream 18mm Compatible
Chronograph 30CH
30CH-1951 Stainless Steel White 18mm Compatible
30CH-1952 Stainless Steel Silver 19mm Compatible
30CH-BLK-1953 Stainless Steel Black 19mm Compatible
30CH-LAN-1955 Stainless Steel Silver 19mm Compatible
30CH-RG-1956 Rose Gold Silver 19mm Compatible
30CH-1957 Stainless Steel Silver 19mm Compatible
30CH-AM-1958 Stainless Steel Silver 19mm Compatible
Conquest
18mm / 19mm / 20mm / 21mm / 22mm 18 refs +
Reference Material Dial Lug Smartlet
Conquest 100m
CQ-1988-100M Stainless Steel Silver 20mm Compatible
Conquest 41
L3.430.4.09.6 Steel Green 20mm Compatible
L3.430.4.52.6 Steel Black 20mm Compatible
L3.430.4.97.6 Steel Blue 20mm Compatible
Conquest 43
L3.700.4.56.6 Stainless Steel Black 22mm Compatible
Conquest Auto
L3.778.4.56.6 Stainless Steel Black 21mm Compatible
L3.778.4.96.6 Stainless Steel Blue 21mm Compatible
Conquest Chronograph
L3.835.4.56.2 Steel Black 22mm Compatible
L3.835.4.92.2 Steel Blue 22mm Compatible
Conquest Early
Cal19AS-1954 Stainless Steel Silver 18mm Compatible
Conquest JDM
JDM-CQ-1998 Stainless Steel White 19mm Compatible
Conquest Power
Cal290-1956 Stainless Steel Silver 18mm Compatible
Conquest VHP
L3.726.4.56.6 Steel Black 20mm Compatible
L3.726.4.96.6 Steel Blue 20mm Compatible
L3.727.4.56.6 Steel Black 21mm Compatible
L3.727.4.76.6 Steel Silver 21mm Compatible
L3.716.4.56.6 Stainless Steel Black 21mm Compatible
L3.716.4.96.6 Stainless Steel Blue 21mm Compatible
DolceVita
18mm / 19mm / 20mm 4 refs +
Reference Material Dial Lug Smartlet
DolceVita Chronograph
L5.657.4.51.2 Stainless Steel Black 20mm Compatible
DolceVita Early
L5.155.4.16.6 Stainless Steel White Roman 18mm Compatible
DolceVita Rectangular
L5.655.4.71.3 Stainless Steel Silver 19mm Compatible
DolceVita Small
L5.655.4.71.6 Stainless Steel Silver Small Seconds 19mm Compatible
Dress
18mm 1 refs +
Reference Material Dial Lug Smartlet
JDM-DR-1990 Stainless Steel White 18mm Compatible
Elegant
18mm / 20mm 2 refs +
Reference Material Dial Lug Smartlet
L4.310.4.12.6 Stainless Steel Silver 18mm Compatible
L4.910.4.92.6 Stainless Steel Blue 20mm Compatible
Evidenza
18mm / 20mm / 21mm 5 refs +
Reference Material Dial Lug Smartlet
Evidenza Automatic
L2.642.4.73.4 Stainless Steel Silver 18mm Compatible
Evidenza Chronograph
L2.642.4.51.4 Stainless Steel Black 18mm Compatible
Evidenza Early
L2.643.4.51.0 Stainless Steel Black 21mm Compatible
L2.642.4.73.3 Stainless Steel Silver Guilloché 20mm Compatible
Evidenza Moonphase
L2.643.4.78.6 Stainless Steel Silver 21mm Compatible
Flagship
18mm / 19mm 11 refs +
Reference Material Dial Lug Smartlet
Flagship 12.68Z
Cal12.68Z-1958 Stainless Steel Silver 18mm Compatible
Flagship Anniversary
L4.746.4.72.4 Stainless Steel Silver 19mm Compatible
Flagship Auto
L4.974.4.12.6 Stainless Steel White 19mm Compatible
Flagship Early
Cal340-1958 Stainless Steel Silver 18mm Compatible
Flagship Heritage
L4.795.4.78.2 Stainless Steel Cream 19mm Compatible
L4.795.4.52.0 Steel Black 19mm Compatible
L4.795.4.78.2 Steel Silver 19mm Compatible
Flagship JDM
JDM-FS-1997 Steel/Gold Cap Champagne 18mm Compatible
JDM-FS-2003 Stainless Steel Silver 18mm Compatible
JDM-FS-2004 Stainless Steel Black 18mm Compatible
Flagship Linen
Cal340-Linen-1962 Stainless Steel Silver Linen 18mm Compatible
Grand
19mm 1 refs +
Reference Material Dial Lug Smartlet
9712-1990 Stainless Steel Silver 19mm Compatible
Greenlander
20mm 1 refs +
Reference Material Dial Lug Smartlet
Greenlander-LONG-1945 Stainless Steel Black 20mm Compatible
Heritage
19mm / 20mm / 22mm / 23mm 30 refs +
Reference Material Dial Lug Smartlet
Heritage 1935
L2.838.4.53.2 Stainless Steel Black 22mm Compatible
L2.794.4.53.0 Steel Black 22mm Compatible
Heritage 1945
L2.813.4.66.0 Stainless Steel Salmon 20mm Compatible
Heritage Avigation
L2.816.1.93.2 Bronze Green 20mm Compatible
Heritage Big
L2.816.4.53.2 Steel Black 20mm Compatible
L2.816.1.93.2 Titanium Blue 20mm Compatible
Heritage Classic
L2.828.4.73.2 Stainless Steel Silver Sector 19mm Compatible
L2.828.4.53.2 Steel Black Sector 19mm Compatible
L2.828.4.73.2 Steel Silver Sector 19mm Compatible
L2.828.4.53.2 Stainless Steel Black Sector 19mm Compatible
Heritage Column-Wheel
L2.750.4.56.2 Stainless Steel Black 20mm Compatible
Heritage Diver
L2.744.4.56.2 Stainless Steel Black 22mm Compatible
L2.808.4.52.6 Stainless Steel Black/Red 22mm Compatible
L2.841.4.56.4 Stainless Steel Black 22mm Compatible
Heritage Legend
L3.674.4.50.0 Steel Black 22mm Compatible
L3.774.4.50.0 Steel Black 22mm Compatible
L3.774.4.90.2 Steel Blue 22mm Compatible
L3.774.1.50.2 Bronze Black 22mm Compatible
Heritage Lindbergh
Lind-LE-1996 Stainless Steel White 20mm Compatible
L2.713.4.13.0 Stainless Steel White 20mm Compatible
Heritage Marine
L2.833.4.93.2 Stainless Steel Blue 19mm Compatible
Heritage Military
L2.826.4.53.2 Stainless Steel Black 20mm Compatible
Heritage Silver
L2.834.4.72.2 Stainless Steel Silver 19mm Compatible
Heritage Skin
L2.822.4.56.9 Steel Black 22mm Compatible
L2.822.4.93.2 Steel Brown 22mm Compatible
Heritage Tuxedo
L2.330.4.93.0 Stainless Steel Black/White 19mm Compatible
L2.330.4.93.0 Steel Two-Tone 19mm Compatible
Heritage Type
L2.812.4.23.2 Stainless Steel White Offset 20mm Compatible
Heritage WW2
L2.713.8.11.0 Steel White 23mm Compatible
Heritage Weems
L2.607.4.23.2 Stainless Steel White 20mm Compatible
HydroConquest
18mm / 19mm / 21mm / 22mm 29 refs +
Reference Material Dial Lug Smartlet
HydroConquest 37
L3.780.4.56.6 Steel Black 18mm Compatible
L3.780.4.96.6 Steel Blue 18mm Compatible
L3.780.4.06.6 Steel Green 18mm Compatible
HydroConquest 39
L3.742.4.56.6 Steel Black 19mm Compatible
L3.742.4.96.6 Steel Blue 19mm Compatible
HydroConquest 41
L3.781.4.56.6 Stainless Steel Black 21mm Compatible
L3.781.4.96.6 Steel Blue 21mm Compatible
L3.781.3.56.7 Steel/Gold Black 21mm Compatible
L3.781.3.96.7 Steel/Gold Blue 21mm Compatible
L3.781.4.06.6 Steel Green 21mm Compatible
L3.781.4.76.6 Steel Grey 21mm Compatible
HydroConquest 43
L3.782.4.56.6 Steel Black 22mm Compatible
L3.782.4.96.6 Steel Blue 22mm Compatible
HydroConquest Auto
L3.742.4.56.6 Stainless Steel Black 21mm Compatible
L3.742.4.96.6 Stainless Steel Blue 21mm Compatible
L3.781.4.06.6 Stainless Steel Green 21mm Compatible
HydroConquest Ceramic
L3.781.4.56.9 Ceramic/Steel Black 21mm Compatible
L3.781.4.96.9 Ceramic/Steel Blue 21mm Compatible
L3.784.4.56.9 Ceramic Black 22mm Compatible
L3.784.4.96.6 Ceramic Blue 22mm Compatible
L3.784.4.06.9 Ceramic Green 22mm Compatible
L3.784.4.76.9 Ceramic Grey 22mm Compatible
HydroConquest GMT
L3.790.4.06.6 Steel Green 21mm Compatible
L3.790.4.56.6 Steel Black 21mm Compatible
L3.790.4.96.6 Steel Blue 21mm Compatible
L3.790.4.96.9 Steel Blue 21mm Compatible
L3.790.3.06.7 Steel/Gold Green 21mm Compatible
HydroConquest Titanium
L3.782.4.76.6 Titanium Grey 21mm Compatible
HydroConquest USA
L3.781.4.99.6 Stainless Steel Blue/Red 21mm Compatible
Legend
18mm / 22mm 6 refs +
Reference Material Dial Lug Smartlet
LLD-LE-2009 Stainless Steel Burgundy 22mm Compatible
L3.674.4.50.0 Stainless Steel Black 22mm Compatible
L3.774.4.50.0 Stainless Steel Black Date 22mm Compatible
L3.374.4.50.2 Steel White 18mm Compatible
L3.374.4.56.2 Steel Black 18mm Compatible
L3.374.4.90.2 Steel Blue 18mm Compatible
Lindbergh
18mm / 22mm 2 refs +
Reference Material Dial Lug Smartlet
Lindbergh 1990s
L2.601.4.11.0 Stainless Steel Silver 18mm Compatible
Lindbergh Hour
Lind-LE-YG-2002 18K Yellow Gold White 22mm Compatible
Longines
18mm / 19mm / 20mm / 22mm 15 refs +
Reference Material Dial Lug Smartlet
Longines 1954
L1954-ANNIV-2004 Stainless Steel Silver 19mm Compatible
Longines 30L
30L-1960 Stainless Steel Silver 18mm Compatible
Longines 5-Star
JDM-ADM-1994 Stainless Steel Silver 18mm Compatible
Longines A-7
A7-LE-2002 Stainless Steel White Offset 20mm Compatible
Longines Diver
L3.155.4.52.J Stainless Steel Black 20mm Compatible
Longines Earl
L2.919.4.71.2 Stainless Steel Grey 20mm Compatible
Longines Elegant
JDM-EL-2003 Stainless Steel Silver Sunburst 19mm Compatible
Longines Heritage
L1.611.6.75.2 Gold Cap Champagne 18mm Compatible
Longines Hour
Lind-HourAngle-1931 Stainless Steel White 22mm Compatible
Longines JDM
JDM-Prom-1995 Stainless Steel White 19mm Compatible
Longines Marine
MN-LE-2005 Stainless Steel Silver 19mm Compatible
Longines Silver
JUB-1905-2005 Stainless Steel Silver 20mm Compatible
Longines Sport
LSC-1994 Stainless Steel White 20mm Compatible
L3.615.4.76.6 Stainless Steel Grey 20mm Compatible
Longines Weems
Lind-Weems-1937 Stainless Steel Silver 20mm Compatible
Master
18mm / 19mm / 20mm / 21mm / 22mm 14 refs +
Reference Material Dial Lug Smartlet
Master Annual
L2.910.4.78.3 Stainless Steel Silver 20mm Compatible
Master Chronograph
L2.629.4.51.6 Stainless Steel Black 22mm Compatible
Master Collection
L2.673.4.78.3 Stainless Steel Silver 20mm Compatible
L2.629.4.78.3 Steel Silver 20mm Compatible
L2.257.4.75.6 Steel Blue 18mm Compatible
L2.257.4.78.6 Steel Silver 18mm Compatible
L2.628.4.75.6 Steel Blue 19mm Compatible
L2.628.4.78.6 Steel Silver 19mm Compatible
L2.893.4.71.6 Steel Silver 21mm Compatible
L2.893.4.79.2 Steel Blue 21mm Compatible
L2.673.4.78.3 Steel Blue 20mm Compatible
L2.673.4.78.6 Steel Silver 20mm Compatible
L2.909.4.92.6 Stainless Steel Blue 21mm Compatible
Master Small
L2.409.4.78.6 Stainless Steel Silver 20mm Compatible
Military
18mm / 20mm 2 refs +
Reference Material Dial Lug Smartlet
Military HS°
HS-Longines-1942 Stainless Steel Black 20mm Compatible
Military WWW
WWW-Longines-1945 Stainless Steel Black 18mm Compatible
Presence
19mm / 20mm 4 refs +
Reference Material Dial Lug Smartlet
Presence 38
L4.722.4.12.2 Steel Silver 19mm Compatible
Presence 40
L4.921.4.12.6 Steel Silver 20mm Compatible
L4.921.4.52.2 Steel Black 20mm Compatible
Presence JDM
JDM-PRE-2001 Stainless Steel Silver 19mm Compatible
Professional
20mm 2 refs +
Reference Material Dial Lug Smartlet
L3.635.4.56.6 Stainless Steel Black 20mm Compatible
L3.635.5.88.6 Steel/Gold Cap Champagne 20mm Compatible
Présence
20mm 2 refs +
Reference Material Dial Lug Smartlet
Présence Automatic
L4.921.4.12.6 Stainless Steel White 20mm Compatible
Présence Quartz
L4.790.4.12.7 Stainless Steel/Gold Cap White 20mm Compatible
RAF
18mm 1 refs +
Reference Material Dial Lug Smartlet
6B-Longines-1940 Stainless Steel Black 18mm Compatible
Record
19mm / 20mm 4 refs +
Reference Material Dial Lug Smartlet
Record 38
L2.821.4.76.2 Steel Silver 19mm Compatible
L2.821.4.96.2 Steel Blue 19mm Compatible
Record 40
L2.821.4.72.2 Steel Silver 20mm Compatible
Record Heritage
L2.921.4.56.2 Stainless Steel Black 20mm Compatible
Saint-Imier
18mm / 21mm 2 refs +
Reference Material Dial Lug Smartlet
Saint-Imier Chronograph
L2.752.4.52.6 Steel Black 21mm Compatible
Saint-Imier Date
L2.563.4.78.6 Steel Silver 18mm Compatible
Silver
19mm 1 refs +
Reference Material Dial Lug Smartlet
L2.834.4.72.2 Stainless Steel Silver 19mm Compatible
Skin
22mm 1 refs +
Reference Material Dial Lug Smartlet
L2.822.4.56.2 Stainless Steel Black 22mm Compatible
Spirit
19mm / 20mm / 21mm / 22mm 21 refs +
Reference Material Dial Lug Smartlet
Spirit 40
L3.810.4.53.6 Steel Black 20mm Compatible
L3.810.4.73.6 Steel Silver 20mm Compatible
L3.810.4.93.6 Steel Blue 20mm Compatible
Spirit 42
L3.811.4.53.6 Steel Black 22mm Compatible
L3.811.4.93.6 Steel Blue 22mm Compatible
Spirit Auto
L3.810.4.53.0 Stainless Steel Black 21mm Compatible
L3.811.4.93.6 Stainless Steel Blue 22mm Compatible
Spirit Chronograph
L3.820.4.53.0 Stainless Steel Black 22mm Compatible
Spirit Flyback
L3.821.4.53.6 Steel Black 22mm Compatible
L3.821.4.93.6 Steel Blue 22mm Compatible
Spirit Green
L3.810.4.03.2 Stainless Steel Green 21mm Compatible
Spirit JDM
JDM-SP-1999 Stainless Steel Champagne 19mm Compatible
Spirit Titanium
L3.810.1.73.2 Titanium Grey 20mm Compatible
L3.811.1.73.2 Titanium Grey 22mm Compatible
L3.810.1.53.2 Titanium Anthracite 21mm Compatible
Spirit Zulu
L3.812.4.93.6 Stainless Steel Blue Gmt 22mm Compatible
L3.812.4.06.6 Steel Green 22mm Compatible
L3.812.4.63.6 Steel Black 22mm Compatible
L3.812.4.93.2 Steel Blue 22mm Compatible
L3.802.4.23.6 Steel White 20mm Compatible
L3.802.4.93.6 Steel Blue 20mm Compatible
Tuxedo
20mm 1 refs +
Reference Material Dial Lug Smartlet
TUX-LE-2008 Stainless Steel Black/White 20mm Compatible
USA
21mm 1 refs +
Reference Material Dial Lug Smartlet
L2.784.4.96.0 Stainless Steel Blue 21mm Compatible
Ultra-Chron
18mm / 22mm 4 refs +
Reference Material Dial Lug Smartlet
Ultra-Chron 1968
2221042 Stainless Steel Black 22mm Compatible
Ultra-Chron 2022
L2.836.4.52.6 Stainless Steel Black/Red 22mm Compatible
Ultra-Chron Classic
L2.836.4.52.9 Stainless Steel Black/Red 22mm Compatible
Ultra-Chron Dress
431-1969 Stainless Steel Silver 18mm Compatible
UltraQuartz
18mm / 19mm 2 refs +
Reference Material Dial Lug Smartlet
Cal6512-1970 Stainless Steel Silver 19mm Compatible
UltraQuartz Revival
ULTRAQ-1975 Stainless Steel Silver 18mm Compatible
VHP
18mm / 19mm / 20mm 5 refs +
Reference Material Dial Lug Smartlet
VHP Chronograph
VHP-CHRO-1993 Stainless Steel Black 20mm Compatible
VHP Generation
VHP-G1-1984 Stainless Steel Silver 18mm Compatible
VHP-G1-BLK-1985 Stainless Steel Black 18mm Compatible
VHP-G2-1990 Stainless Steel Silver 19mm Compatible
VHP Gold
5345-VHP-1992 Steel/Gold Cap Champagne 19mm Compatible
Compatible smartwatches

Smartwatches to pair with your Longines

Wear your smartwatch simultaneously with your Longines via Smartlet One. Lug widths 18mm to 24mm natively supported.

Apple Watch
View pairing guide →
Samsung Galaxy Watch
View pairing guide →
Garmin Fenix
View pairing guide →
Garmin Forerunner
View pairing guide →
Garmin Venu
View pairing guide →
Google Pixel Watch
View pairing guide →
Withings ScanWatch
View pairing guide →
Polar Vantage
View pairing guide →
Fitbit Charge
View pairing guide →
Huawei Watch GT
View pairing guide →
Coros
View pairing guide →
Suunto
View pairing guide →
Whoop
View pairing guide →
View all compatible smartwatches →
Questions

Frequently asked questions

Does Smartlet work with Longines watches?+

Yes. Longines references from 18mm to 22mm lug width are natively supported by Smartlet One.

Which Longines models have guides?+

The HydroConquest has a full reference table covering 29 references from 39mm to 43mm.

Will Smartlet affect my Longines?+

No. Smartlet attaches via the spring-bar slots. The L-EVO calibre and case seals are unaffected.

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