Feature: Open source- 51 Microcontroller Open circuit schematic Support phone, handle, PC controling Working time lasts 60mins, large capacity battery 7.4V 1500m Ah High pricision digital servo Blue metal structure Installation video for reference: Click here 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