Features: After the non-closed test, the battery works for about 3 hours with no load in the first gear. After the battery is exhausted, it will be fully charged, and the 5V2A row will be charged for about 2 hours. After the battery is fully charged, the first gear indicator of the electric grinder will turn from red to green. Can be used for various DIY creations or handwork such as grinding, cutting, sanding, engraving, polishing, drilling, etc. High-performance accessories for different wood, glass, metal, plastic and other processes. The lower speed is great for polishing your ring or sanding your pet's nails. brand new and high quality This three-speed speed regulation, copper core motor, small jitter, suitable for literary for play, jade carving and fine grinding and other processes. Specifications: Color:Green Material: ABS Pen:Approx.15.5cm/6.10in Name: Three-speed adjustable USB rechargeable electric grinder set Power: 5W Voltage: 3.6V Chuck size: 0.5-3.2MM (replace the chuck by yourself) Lithium battery capacity: 700MA No-load speed: 5000/12000 rpm Quantity:1 Set Package Includes: 1 Setx Carving Pen Set note: Please allow a little error on the size due to manual measurement. The color might exist slightly difference due to different displays.