16V to 21V multiple options. The function varies depending on the model. Industrial grade charging drill:minimal but not simplify. Comfortable, Strong and Stable:Say goodbye to the tying of the patch, truly all-round simple and easy to carry design. High quality battery :7800 mAh/12800 mA/15000 mAh. Battery three models: universal,Supporting charger.Fast charging charging device design, anti-explosion test. Infinitely variable speed switch, positive and negative: using infinitely variable speed, according to the strength of the handto control the speed, easy to operate! Two-speed adjustment: Two-speed adjustment button for easy switching between fast and slow. Battery quick release: lighting, brushless reverse self-stop light, split machine power indicator light. Packing: carton packaging / plastic box packaging.