4V Cordless Electric Screwdriver Kit: 4.0V No Load Speed: 260rpm Torque: 0. 9~3N. M (variable torque ) Max Torque for Manual: 10N. M Chuck capacity: 1/4"(6. 35mm) Hexagonal Battery type: 1. 50Ah li-ion(inbuilt) Charging interface: MICRO USB Operation time under full charging : 3-4h. Charging time : 45mins(5V/2A)/90mins(5V1A) Including: 32 x screwdriver Bits, 1 x Bit Extension Holder, 2 x HSS Hex Drills, 8 x Sockets, 1 x Socket Adapter, 1 x Flex Extension Hex Shaft,1xpower adapter USB cable,1 x Toolbox; 1 x User Manual.