Dremel 4V Lithium-Ion Variable Speed Cordless Rotary Tool. It features a quick and easy accessory change system, a USB rechargeable battery, an LED battery life indicator, and a portable and lightweight design. It can be used with most Dremel accessories and a selection of attachments. The kit includes a 1/16" engraving cutter, 3/8" aluminum oxide grinding stone, 3/8" brush wheel, 1/2" polished wheel, polishing compound, 1/2" sanding band and mandrel, screw mandrel, wrench, accessory case, universal micro USB cord, 3.6V USB wall plug power supply, manual and quick start guide. It has a maximum speed of 25000 RPM and a 1/8" chuck capacity. It is backed by a 2-year warranty.