Range of Up to 2,625 feet (800m) Accuracy of ±10 Arc Seconds in X & Y Axes; Self-Leveling Within ±5 degrees Dual Grade of ±5%, ±15% if Used w/ Plate Features Laser Manager App for Bluetooth Connectivity Comes w/ Height-of-Instrument Sensor (LS-80X Receiver) Adjustable Rotation Speed (300 or 600 RPM) IP66 Dustproof Topcon 1051612-22 RL-HV2S Dual Grade Laser w/ Rechargeable NiMH Battery & LS-100D Receiver