"Self-Leveling 3 Beam Laser Dot simultaneously projects 3 self-leveling beams. Magnetic base holds tight to steel framing track. Dust and water resistant. Base Type Magnetic base, Battery Included Yes, Beam qty. 3, Beam Type Dot, Class Rating Class IIIa, Battery Life Approx. 50 hrs., Battery Type AA, IP Protection Class IP 54, Laser Beam Color Red, Laser Output Locking mechanism protects inner pendulum during transportation"