Feature: Open source Open circuit schematic Support phone, handle, PC controling Working time lasts 60mins, large capacity battery 7.4V 1500mAh High pricision digital servo Blue metal structure Installation video for reference: Package Included: 1x Robot arm frame(Without assembled) 1x 7.4v battery, charger 1x PS2 handle, receiver 1x LDX-335MG servo(For Claw Holder) 1x Servo control board 1x Bluetooth 4.0 module 4x LDX-218MG digital servo 1x LD-3015mg digital servo(For bottom board) 2x Servo extension cord Some Winding pipe ties