Introduction:This instrument is equipped with the semiconductor diode with wavelength of 532nm,which the laser beam has supreme visibility. And the laser module of instrument will rotate freely to form a laser-scanning surface.Emitting direction of rotary laser-beam illustrated as follows:When the instrument is set upright,it will emit laser-beam to form a horizontal scanning surface and a plumb line automatically.When set horizontally,it will form a plumb scanning surface and a vertical line.We provide 2 years free warranty.Technical Parameters:1.Leveling Accuracy:Horizontal: 20" Vertical 20"2.Measuring Range:Diameter:500m(Using the laser detector)3.Spinning Speed:0 60 120 300 600r.p.m4.Drectional-Scanning Angle:0° 10° 45° 90° 180°5.Slope-adjusting Range:5°(Bi-directional)6.Light Source:Green Laser Diode, wavelength: 532nm7.Down Point Diode:Accuracy:1mm,1.5m8.Working Temperature:4°F to 113°F9.Power Supply:DC 4.8 to 6V(4 section of NI-MH batteries or 4 section of NI-MH rechargeable batteries)10.Hours in continuous use:Approximately 20 hoursFeatures:1.Rechargeable Battery and Charger.2.5 Degree Self levelling Range. 3.Electronic Vials and Positioning Motors.4.All fuctions can be used with remote controlHow to usePlease refer to the following product user manualhttp://www.jinlantrade.com/eBay/rotary%20laser/Operating%20Manual.doc