Green, self-leveling laser. Projects 3 laser planes at 360°: a horizontal plane and two vertical planes at 90 ° to each other Plumb line always visible with 4 squares at the walls 2 crosses, one at the ceiling and on the ground external to the base of the structure for always visible plumb Optical glasses High visibility Easy ceiling positioning (< 2 cm) Indoor and outdoor use. Automatic laser flashing and audible warning if the device is outside the self-leveling range Integrated locking system to prevent vibration during transport, possibility of projecting laser also with a fixed inclined position Compact, non-slip rubber bumper Li-ion rechargeable battery plus a spare battery and external charger Optional: sliding base with the possibility of small gliding movements in all directions for fast positioning