Compact and lightweight for easy handling! Weighs just 9 1/2 ounces. Quiet trouble-free motor delivers 4,600 rpm so you can work quickly. Ideal for drafters, architects, engineers and graphic artists. Features long-lasting Ni-MH batteries that recharge in the desktop stand, or you can connect the eraser to the adapter for continuous AC. Central fingertip switch for right- or left-handed use. Includes recharging stand, charger pack, AC adapter and two 1/4" diameter eraser strips. UL and CSA listed. Electric Eraser Type: Cordless Rechargeable; Uses Eraser Strips: Staedtler? (STD-527-05); Machine Length: 9 1/2 in; Compliance, Standards: UL and CSA listed.