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 don't 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