CST/berger 57-LM800PKG Dual-Slope Electronic Self-Leveling Rotary Laser with Up Plumb Beam Horizontal self-leveling rotary laser kit with detector Single-speed rotation; dual-slope up to 10 percent; anti-drift system; motorized electronic self-leveling for speed and convenience Heavy duty glass-enclosed beacon and sealed housing is water- and dust-proof Includes rechargeable Ni-Mh battery, charger, remote, ceiling targets, wall bracket, glasses, LD400 detector and clamp, case, tripod, rod, manual Class IIa laser product, &lt;1mW power output Low-battery indicator; 2-year warranty