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 Type : Red 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