Features:  3 laser lines (2 vertical and 1 horizontal), 4 points.  With horizontal, vertical, and cross three stalls, vertical lines can extend over the ceiling, you can switch freely, easy to use.  360 rotating base with fine tuning knob.  High brightness laser, 30 times strong light,far away range, the outdoor working effect is better than the red line.  The dial can measure the angle of the ceiling and the ground.  Waterproof,dustproof and high precision.  With light point designed outdoor environments, provide convenience for the construction.  With aluminium alloy tripod,can adjusta the height,more convenient to use.     Specifications:  Material: Plastic+Aluminium alloy.  Working Temperature: -10 ℃~ 45 ℃.  Power: AC 220v or 3 x 1.5V AA Dry Battery(Included a dedicated lithium battery).  Vertical and Horizontal Precision: ±1mm /5m.  Cartesian Precision: ±1mm /5m.  Wave Length: 635nm.  Color: Green.  Size: 19.5 x 9.8cm.  Working distance:Indoor working radius of about 10m. When using an outdoor receiver operating radius above 30m.     How to use:  1. Set the instrument on the tripod or a stable surface, adjust the instrument. If the instrument is too tilted, out of range (3 degrees), the laser tube will automatically turn off (or if audible alarm).  2. Switch knob clockwise to open the instrument, the instrument top green indicator light, while emitting a laser beam.  3. Turn the instrument, the laser beam toward goals.  4. Gently adjust knob, find work orientation.  5. When work is over, turn the switch knob counterclockwise, turn off the instrument.     Package included:  1 x Laser Level(include battery).  1 x Adapter (US plug).  1 x Protective glasses.  1 x Belt.  1 x Plastic protective case.  1 x Tripod with bag.  1 x Battery