Zte Blade A3 2019 - Emergency and Electrical Safety; Emergency Calls and Loud Noise; Electrical Safety and RF Interference

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NOTE:
If the battery is extremely low, you may be unable to power
on the phone even when it is being charged. In this case, try
again after charging the phone for at least 20 minutes.
Contact the customer service if you still cannot power on the
phone after prolonged charging.
Powering On/Off
 Press and hold the Power key to turn on your phone.
 To switch it off, hold the Power key to open the options
menu and touch Shut Down > OK.