A VOLTAGEadapter will NOT be necessary and should NOT be used, however a simple PLUG adapter will be necessary.
电压适配器将没有必要也不应使用，但一个简单的插头适配器将是必要的。
2
In the rated voltage, we used a flashlight conventional voltage 3.7v, charger adapter is more convenient.
在额定电压方面我们采用的是手电筒常规电压3.7 V，充电器的适配更为方便。
3
The ac adapter (as it's more accurately known) simply converts the ac current from a wall outlet into low-voltage, low-amperage DC current that it provides via a USB port.