Function: 1. VERSATILE: This electric rotary grinding pen set includes high-performance tools with low noise and accessories for fine DIY work. Perfect for carving, grinding, milling, polishing, ideal for making resin crafts. 2. MULTIPLE SPEED ADJUSTMENTS: The cordless grinding pen features multiple speed adjustments, 6000-20000 RPM, making it easier to control the speed and meet the power needs of different tasks. This allows for safe and precise grinding in stages. 3. SMALL AND LIGHTWEIGHT: This electric grinder is powerful, yet small and lightweight, giving you great control and precision as well as comfort. 4. CONTINUOUS WORK: The electric grinder can work continuously for up to 200 minutes. You can use it multiple times on a single charge, which is stress-free and convenient, allowing you to work continuously. 5. LIGHTING-LED: The small cordless grinding pen has a lighting LED design that reduces background shadows, giving you a better experience and more precise work. Specification: Item Type: Intelligent Electric Grinding Unit Material: Aluminum Alloy Battery: Lithium battery 3.7V 650mAh (with built-in battery). Package List: 1 x Electric Polishing Pen 1 x USB Cable 8 x Accessories