Features: Features a reciprocating mechanism with 2800/3600 strokes per minutes and stable 2.5Mm±0.1Mm travel, ensuring faster and more uniform grinding for arting lines, and excess materials compared to manual methods. Includes 8 nylon grinding heads and 12 pre cut sandpapers (#400~#1500) for flat, curved, narrow, and corner surfaces, suitable for rough grinding and fine polishing. Offer three adjustable speed settings for different materials and processes, with LED indicators for clear visibility of power and working condition, ensuring easy operations for beginners. Lightweight pen styles design (54.5±1G) reduces hand fatigue; built in 280mAh battery fast charging via Type C, ideal for home or travel use. Featuring easy to change grinding heads and quick attach sandpaper for seamless detailing and repairs. Specifications: Component: ABS. Size:Approx.178x21x18mm/7.01x0.82x0.7inch Weight: 300g. Voltages ranging: 3.7V-5V. Working strokes: 2.5mm. Power supply methods: built-in lithium batteries, Type‑C fast charging. Battery capacity: 280mAh. Package Includes: 1 Set Miniature Sander Tool note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you donot mind before you order. 2.Due to the differences between different monitors, the picture may not reflect the actual color. Thanks for your understandings.