"Self-Leveling 3 Beam Laser Dot simultaneously projects 3 self-leveling beams. Magnetic base holds tight to steel framing track. Dust and water resistant. Dimensions L x W x H in. 4 3/16 x 2 9/16 x 4 1/2, Class Rating Class IIIa, Interior Range ft. Up to 100, IP Protection Class IP 54, Leveling Type Self-leveling pendulum, Beam qty. 3, Battery Type AA, Laser Output Locking mechanism protects inner pendulum during transportation"