Overview This upgraded wireless electric grinder pen is designed for hobbyists and DIY enthusiasts seeking a versatile, portable tool for detailed engraving, polishing, and light grinding tasks. Featuring a rechargeable lithium battery and three adjustable speed settings, it offers flexibility and convenience for various projects, while its dual charging and operation capability ensures uninterrupted use. Product Details Crafted from durable metal, this compact engraving pen delivers reliable performance with speeds ranging from 5,000 to 18,000 RPM. It includes a comprehensive accessory set for multiple applications and supports continuous operation via USB power during charging. Easy to handle and suitable for precise detail work, it is ideal for crafting, model-making, and small-scale modifications. Key Features 1. Adjustable High-Speed Performance – Offers three precise speed modes (5,000 to 18,000 RPM) to accommodate different materials and tasks, enabling professional-grade control. 2. Rechargeable & Dual-Power Function – Equipped with a built-in lithium battery for cordless use and supports simultaneous charging and operation via USB for non-stop workflow. 3. Wide Compatibility – Features a 2.35mm clamping diameter, compatible with all standard 2.35mm grinding heads, drill bits, and accessories. 4. Complete Starter Kit – Includes an engraving pen, USB cable, 2 drill bits, 3 saw blades, 30 assorted bits, 1 tungsten steel bit, and 1 connecting stick for versatile project readiness. 5. Portable & User-Friendly – Compact, lightweight design allows for comfortable handling and precise control in detailed work, ideal for both beginners and experienced users. Specifications - Voltage: 4.2V - Speed Range: 5,000–18,000 RPM - Clamping Diameter: 2.35mm - Material: Metal - Color: As Shown Package Contents 1 × Engraving Pen 1 × USB Cable 2 × Drill Bits 3 × Saw Blades 30 × Assorted Bits 1 × Tungsten Steel Bit 1 × Connecting Stick Usage Notes - Fully charge before first use. - Not recommended for heavy-duty carving, punching, cutting, or grinding. - Operational noise and temperature increase are normal. - Slight color variations may occur due to lighting and display differences. - Measurement tolerance: ±1–3 cm. Only the listed items are included in the package.