Sgnl is not a smart watch or a smart band but rather a 'Smart Strap'.
If you have a normal watch that uses the normal method of attaching the strap to the watch,
a pin (18, 20, 22 or 24mm) can be attached to any watch whether a smart watch an analog watch.
(Apple watches require a connector.)
Upgrade an Analog Watch to a Hybrid Watch
All analog watch users can not only use the 'fingertip call' function by connecting Sgnl,
but they can also upgrade to a 'Hybrid Watch' that includes smart functions such as
measuring exercise, notifying of email, messages and apps and call reminder.
Make your Smart watch Even Smarter
Smart watch users can use their smart watch for message notification or health check functions,
and by adding Sgnl fingertip call function can make their smart watch even smarter.
Use as a Smart Band Without a Watch
Signal provides an accessory that can be used as a smart band for those without watches.