How to safely shut down or force shut down Alldocube devices

Alldocube Free Young X5 Alldocube Free Young X5
Alldocube Power M3 Alldocube Power M3
Alldocube X1 Alldocube X1
Alldocube M5 Alldocube M5
Alldocube M5 S Alldocube M5 S
Alldocube M8 Alldocube M8
Alldocube M5XS Alldocube M5XS