2 RFID chips inside
genuine leather strap
color: black
Width: 22mm
Length: 90+115mm
 
There are 2 RFID chips in the watch strap, that does not require charging. So replacing the watch battery every 2-3 years to keep the watch running is all you need to do.
With tapping your smart phone on the watch strap, you can immediately start any app or activate any desired action on your smart phone . Or you can even control some external devices.
See video for more details:
 
https://www.youtube.com/watch?v=75CXPXi_skg
https://www.youtube.com/watch?v=aeCgr7bszf8