The Johnson Level Hot Shot Laser Mouse adheres to any surface for hands free use and can project a laser line up to 30 feet. Features built-in horizontal and vertical leveling vials. Laser Beam Color: Red, Accuracy: ±1/2 in. at 20-Feet. (±2mm at 1m), Beam Type: Line, Beam (qty.): 1, Laser Output: <=1mW, Interior Range (ft.): Up to 30, Mount Type: Super stick adhesive system, Battery Type: AA, Dimensions L x W x H (in.): 4 5/16 x 2 1/2 x 1 3/4, Battery Included: Yes, Case Included: Yes, Class Rating: Class II, Laser Wavelength: 635nm ±10nm, Leveling Type: Manual, Working Temperature: 14deg F to 113deg F.