Stabila 05500TR Type LAR200 OFF-ROAD Laser System Patented "SPS" Shock Protection System takes a 6' drop to concrete Dust, Rain and Weather Proof User friendly, one switch, one knob, one function Battery life: up to 120 hours Included De-Tech receiver shows exact distance to grade in 1/16's or mm's Class IIIa Power output&lt;5mW