Feature: 1. C-harging and plugging dual use, can be connected to the power while charging, more efficient. 2. There is an inner hexagon wrench receiving hole at the rear. 3. Jacking type grinding heads lock mode, no skid. 4. LED displays power, speed, and load information, giving you more accurate control of the Grind Tool. 5. Made of fine quality material for long service time. Specification: Suitable for various kinds of stone carving, wood carving, olive carving, plastics carving, carving, ceramic carving, drilling and metal surface grinding, engraving, trimming, etc. Features: C-harging and plugging dual use, can be connected to the power while charging, more efficient. There is an inner hexagon wrench receiving hole at the rear. Jacking type grinding heads lock mode, no skid. LED displays power, speed, and load information, giving you more accurate control of the Grind Tool. Made of fine quality material for long service time. Specifications: Color: silver Power: 8W Clamping diameter: 3mm Motor speed: 1 gear 5000, 2 gear 10000, 3 gear 18000 Battery: 3.6V, 300mAh USB cable length: 0.5m Package size: 210 * 135 * 35mm / 8.3 * 5.3 * 1.4in Package weight: 120g / 4.2ounce Packing List: 1 * Engraving Pen 1 * USB Cable Package List: 1 * Engraving Pen 1 * USB Cable