Specifications: Red Laser Beams Working Range: 0~30 m 1 Horizontal Line4 Vertical Lines Levelling accuracy:±1.0mm at 5 m Line accuracy ±1.5mm at 5 m Levelling time<3s Self-levelling range ≤3° Laser Class 3R?<5mW With Cross Lock Function With Laser Gain Function Operating temperature 0~+40? Operating temperature -20~+70? Batteries AA(1.5V)*4 Weight without batteries 980 g