PLS HVR505 G System is a fully automatic, dual slope green beam laser. The green beam has 3 times the visible range indoors as a red beam laser (about 300 feet in job site lighting) making this laser ideal for interior ceilings and walls in large spaces. Why spend extra for a green beam? Longer interior visibility! The HVR505 G is self leveling horizontal-vertical and can also be used outdoors (500 foot radius, 1000 foot circle) with a laser detector (included). Accurate to 1/8-Inch per 100 feet. The laser also features a height of instrument (bump alarm) that can be engage to warn the contractor if the laser has been bumped changing the established benchmark. 4 rotation speeds plus 4 sizes of Fan control. Fan is a partial rotation allowing the laser dot to oscillate back and forth just where you need the information. The advantage of the Fan is the laser can be set up and not interfere with other workers in a different location on the jobsite. Dual slop control allows the laser to be manually sloped on 2 plains independently or together for drainage or a sloped ceiling. The HVR505 G System includes laser, detector, remote control, ceiling bracket, target card, 2 battery packs (NIMH and alkaline) NIMH battery charger, case and operation manual.