Fetaures: Mini size and lightweight for easy carrying and using. Humanized design, long time operation is not easy to fatigue. One button to adjust forward/reverse. Strong pure copper motor, low noise, long service time. High concentricity, small rotation, alloy gear, stable. USB rechargeable design, you dont need to worry its battery. Specifications: Type: set A, set B, set C (optional) Torque: max. 3N.m Working voltage: 3.7-4.2V No-load speed: 220r/min Main color: black Rated power: 4W Battery: 3.7V, 1200mAh Item size: 175 * 43 * 43mm / 6.9 * 1.7 * 1.7in Package size: 225 * 70 * 55mm / 8.9 * 2.8 * 2.2in Package weight: Set A: 197g / 6.9ounce Set B: 210g / 7.4ounce Set C: 400g / 0.9lb Packing List: Set A: 1 * Electric Screwdriver 1 * USB Cable 1 * User Manual 1 * Screwdriver Bit Set B: 1 * Electric Screwdriver 1 * USB Cable 1 * User Manual 10 * Screwdriver Bit Set C: 1 * Electric Screwdriver 1 * USB Cable 1 * User Manual 42 * Screwdriver Bit 1 * Flexible Shaft 1 * Plastics Storage Box