The battery protection circuit on the circuit board is anti-overload, anti-over-discharge, anti-over-current, anti-short circuit and anti-reverse connection, balanced charging, stable and safe work 5v onboard voltage regulator chip, USB interface can provide up to 2.5a continuous output current, 5v power supply can be output, convenient to supply power to other main control boards On-board warning indicator, easy to check whether the battery has been replaced Plug Type:US Plug,it applies to Canada, India,Mexico, Thailand, the , the Philippines,Taiwan and so on. Voltage: AC110V Without battery Material:plastic colour:Blue Package Contents: 1 x Expansion Board 2 x Screws 2 x Nut 1 x Pin 1 Supply (with a adpter) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.