Replace your strap
Smartlet replaces your mechanical watch strap via the standard spring-bar system. Classic, Shadow, or Titanium. No tools required.
The Apple Watch carries the screen, the notifications and the apps, and it charges every day. The Panther Eclipse answers the other side, screen-less stainless steel, no subscription, 14 to 15 days of battery, reading HR, HRV, SpO2, temperature and blood pressure on the inner wrist.
Smartlet keeps both on one strap rather than two bands.
Smartlet replaces your mechanical watch strap via the standard spring-bar system. Classic, Shadow, or Titanium. No tools required.

Smartlet uses a dedicated adapter or native lug pins depending on your smartwatch. The connector snaps onto the Smartlet module. Zero modification to the mechanical watch.
Both watches sit on the same wrist. All smartwatch sensors maintain direct skin contact and operate normally.