The Spectra Precision® LL300N laser level has a robust construction with a protective cage for the rotor which provides superior durability against falls and bad weather. Its specially designed construction to withstand falls on concrete surfaces or tripod tipping up to 1.5 m (5 ft) tall will help reduce downtime and repair costs. This set includes an LL300N laser level, an HL450 receiver, a measuring rod (metric), a tripod, a C45 mounting bracket for measuring rod, a rigid carrying case, as well as 4 alkaline type D batteries. Type of laser: 650 nm visible, class 2 Laser accuracy: ± 2.2 mm over 30 m (± 3/32 in over 100 ft) Range: 500 m (1,650 ft) in diameter Self-leveling range: ± 5 degrees Leveling system: electronic self-leveling Manual one-axis slope mode (with self-leveling mode on the second axis) with optional RC601 remote control Warning out of level: the rotor stops, the red LED out of level HI flashes Power supply: 4 alkaline or NiMH type D batteries Battery life: 45 hours with rechargeable batteries, 90 hours with alkaline batteries Battery LED status: red LED flashing Rotation speed: 600 rpm Tripod mount (horizontal and vertical): 5/8 in x 11 Operating temperature: -20 ° C to 50 ° C Storage temperature: -20 ° C to 70 ° C Protection index: IP66 - protection against dust and water jets Impact resistance: drop onto concrete floor up to 1 m (3 ft) Dimensions: 27.2 x 19.7 x 20.1 cm (10.7 x 7.7 x 7.9 in) Weight: 2.7 kg (5.9 lb) Warranty: 5 years.