SIMPLE 3 SPEEDS ADJUSTMENT: One button to switch rotation speed among 5000-15000r/min, which adapt to different working situation.* ENERGY SAVING: This electric drills powered by USB cable, which is eco-friendly, energy saving and convenient to use.* PORTABILITY AND CONVENIENCE: Provided with the overload protection, let the work become safe and reliable; Ergonomics handle is for comfortable gripping, use anywhere anytime.* VARIETY OF BITS ASSORTMENT: The accessories helps do different work like drilling holes, grinding, graving and others.* Applicable to stainless steel, porcelain, stone, glass, plastic, wood, bracelet, etc.Specifications:Input Voltage: 5V/2AOutput Power: 30WSpeed: 5000-15000r/minClamping Dia.: 0.5-3.2mmSize: Approx. 168x25mmPerfect For: Sanding, grinding, polishing, deburring, engraving, dust removing, drilling and more.Package Included:1 x Black Rotary Tool Machine5 x Brass Collets(1.0, 1.5, 2.0, 2.5, 3.0)3 x Grinding Bits6 x Drill Bits1 x Mini Spanner1 x USB Cable