*Level accuracy: ±1mm/7m
*Vertical accuracy: ±1mm/7m
*automatic leveling:  ±3º
*lauch angle: vertical≥110º, level≥120º
*line laser wavelength: 635nm
*working radius: 10m in house, with detector >50m
*laser power: <1mw
*power: 4.5V
* continuous working hours : 8hours