DEWALT DW073 Cordless Rotary Laser Level, Power Source: 6V - 18V DC, Laser Class: 3R, Laser Range: Up to 1000 ft with detector, Accuracy: ±1/8 inch at 100 ft, Rotation Speed: 0-600 rpm, Battery Type: NiMH/NiCad, Carrying Case Included, Serial: 432989.