Please note:This is a wired grinder and needs to be used with a power supply. We will give you a USB data cable. You only need to prepare a charger suitable for the USB interface to plug in. This specification is suitable for indoor/family Use, please pay attention before placing an order! !Engraving Pen USB Charging Variable Speed Mini Grinder Machine Rotary Tools Kit Grinder Set with Engraving Acceories Kit * 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 acceories helps do different work like drilling holes, grinding, graving and others. * Applicable to stainle steel, porcelain, stone, gla, plastic, wood, bracelet, etc. Our electric drills are suitable for most sizes, and the adapter head can be changed according to the size of the tool, which can be purchased in the acceories How to use it? please see! - Input Voltage: 5V/2A - Output Power: 30W - Speed: 5000-15000r/min - Clamping Dia: 0.5-3.2mm - Size: Approx. 168x25mm - Perfect For: Sanding, grinding, polishing, deburring, engraving, dust removing, drilling and more. We provide different specifications for you to easily choose what you want, 40pcs acceories, 105pcs acceories, 161pcs acceories, 217pcs acceories,Electric grinder + 10 acceories + an adapter line,Electric grinder + 40 acceories + an adapter line,Electric grinder + 105 acceories + an adapter line,Electric grinder + 161 acceories + an adapter line,Electric grinder + 217 acceories + an adapter line Payment: 1) supportsVisa,MasterCard, Maestro Debit Card, and wire transfervia banks.2)Please make payment within 3 days of your order if poible.We will just ship the goods to you according to the addrethat you wrote in ,if you wanna change, please leave a meage when you place the order.Shipping:1)Normally,the parcel will arrivein 15-45 days.But We do not guarantee delivery time on all international shipments due to difference in customs clearing times in individual countries, which may affect how quickly your product is inspected.2)We will send the itemswithin 1-5 working daysonce your payment is completely verified.It the package doesn't arrive in 60 days,please tell us and we will refund.Size:All dimensions are measured by hand, theremay be 0-2cm deviations.Colors:Differences in color may be caused by some other reasons such as color reflection in the monitor, lighting, background etc. However, if you believe that the item received is wrong color, please contact us to see if a return or refund ispoible.Meage:1)Your feedback is extremely important to us. Please click 5 stars feedback if you like our items and service. I willprovide competitive price and better service all the way.Please contact us before leaving any negative feedback or opening any dispute on .We understand the unhappine you might have if the order go wrong, as we think any problems will be solved after activecooperation and good communication!2)All emails will be answered within 1-2 busine day. If you do not receive our reply, please kindly re-sent your email and we will reply to you as soon as poible.