Wear a Smartwatch with Your Seiko | Smartlet

Smartlet One is compatible with all Seiko Prospex, Presage, and 5 Sports references using 18mm 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.

Seiko makes movements in-house across every price point - from the 7S26 in the 5 Sports to the Spring Drive calibres in Grand Seiko. The Prospex Turtle earned its affectionate name from a case shape designed around water resistance. The Presage applies urushi lacquer and enamel dial techniques from Japanese craft tradition. Seiko's range is wide enough that any collector owns at least one reference they would not replace. Smartlet One fits every Seiko with standard lugs via spring bars - no adapter, no modification.