SPECIFICATION Laser type : Green beam, 520nm, class 2 (IEC/EN60825-1/2007) , <1mW Laser accuracy: ±1mm/7m Operation functions: Self-leveling mode, Manual-leveling mode Auto level range: ±4° Out-of-level indication: Optical signal/Audible Transport lock: Yes Thread for attachment connection (inch): 1/4 IN. at bottom Tool Height (inch): 4.7 Tool Length (inch): 4.3 Tool Weight (pound): 1.26 Tool Width (inch): 3.5 Typical Laser visibility/working range (ft): 98ft Battery Hours: 6 hours each