Spectra Precision Lasers / Trimble LT56 3 Plane Laser Tool W Manual, Bracket,Target and Case Bright crisp laser lines - extends the working range and are easy to see Lithium-Ion batteries provide 25-40 hour operating time - huge savings on battery cost compared to alkaline models and are ecological friendly Rugged and durable - 3 foot (1m) drop specification means the LT56 can keep working even after minor accidents Versatile mounting accessory - includes ceiling track, magnetic and tripod mounts with rotation and fine vertical adjustment 3 Year Limited Warranty Laser class 2