How to safely shut down or force shut down Acer devices

Acer Liquid Z410 Acer Liquid Z410
Acer Liquid Z220 Acer Liquid Z220
Acer Liquid Z520 Acer Liquid Z520
Acer Liquid Jade Z Acer Liquid Jade Z
Acer Iconia Tab A3-A20FHD Acer Iconia Tab A3-A20FHD
Acer Iconia Tab A3-A20 Acer Iconia Tab A3-A20
Acer Iconia One 8 B1-820 Acer Iconia One 8 B1-820
Acer Iconia Tab 10 A3-A30 Acer Iconia Tab 10 A3-A30
Acer Liquid Z530 Acer Liquid Z530
Acer Liquid Z530S Acer Liquid Z530S
Acer Liquid Z630 Acer Liquid Z630
Acer Liquid Z630S Acer Liquid Z630S
Acer Liquid Z320 Acer Liquid Z320
Acer Liquid Z330 Acer Liquid Z330
Acer Predator 8 Acer Predator 8
Acer Liquid Zest Acer Liquid Zest
Acer Liquid Zest Plus Acer Liquid Zest Plus
Acer Liquid Jade 2 Acer Liquid Jade 2
Acer Liquid X2 Acer Liquid X2
Acer Iconia Tab 10 A3-A40 Acer Iconia Tab 10 A3-A40