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 work5v 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 boardsOn-board warning indicator, easy to check whether the battery has been replacedPlug Type:US Plug,it applies to Canada, India,Mexico, Thailand, the United States, the Philippines,Taiwan and so on.Without batteryMaterial:plasticcolour:BluePackage Contents:1 x Expansion Board2 x Screws2 x Nut1 x Pin1 x Power Supply (with a adpter)Only the above package content, other products are not included.Note: Light shooting 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.