Redmi Watch 4 has a power button.
Power on:
1. In the power-off state, press and hold the power button for about 5 seconds to turn on the watch and enter the home screen;
2. In the power-off state, connect the watch charger for about 5 seconds to turn on the watch and enter the watch home screen.
Power off:
1. In the power-on state, press and hold the power button for 3 seconds the watch will enter the page of reboot, shutdown, restore factory, choose shutdown;
2. In the power-on state, tap [Settings] >> [System Operation] >> select [Power off].
Reboot:
1. In the power-on state, press and hold the power button for 3 seconds the watch will enter the page of reboot, shutdown, restore factory, and select reboot;
2. In the power-on state, keep pressing and holding the power button for about 15 seconds, the watch will be forced to reboot;
3. In the power-on state, tap [Settings] >> [System Operation] >> select [Reboot].