Self-Leveling 3 Beam Line Laser Kit - DW089K. (4) AA Batteries. Ceiling Mount. Kit Box. Class 2 Laser Product, < (30mW) Power Output, Wavelength (630-680 nm). Accurate to +/- 1/8 in. at 30 ft. for level applications. 3 beam line laser aids in 90 Degree layouts. Built-in magnetic pivot bracket mounts easily on metal surfaces. Laser diode is two times brighter for increased visibility in bright job site conditions. Simple one button operation with easy to use control panel. Micro adjustment knob a