Did you review the sidebar questions? Just guessing, dead battery. If familiar with battery voltage required to power up these watches, removing and temporarily supplying correct battery voltage to the two(?) contacts should allow the watch to power up. Either the watch turns on with temporary power to prove a dead battery or the watch electronics failed.
2 
The s2 can not turn on and it can't charge
reginabuabeng23 さんによる
Did you review the sidebar questions? Just guessing, dead battery. If familiar with battery voltage required to power up these watches, removing and temporarily supplying correct battery voltage to the two(?) contacts should allow the watch to power up. Either the watch turns on with temporary power to prove a dead battery or the watch electronics failed.
F Dryer さんによる