Specifications : Line: 12 / 16 Lines Light Color: blue Laser class:Class2,output power<1mW Line type:3* 360° plane(3D)/4*360° plane(4D) Wavelength:515nm(Green) Accuracy:±1.5mm/7m Line working distance:30m Working temperature:-10°C~+50°C Waterproof grade: IP-54 Power supply:1pc 2400mah Rechargeable Battery Pack Features : -12 / 16 line irradiation, 360° without dead angle. Suitable for different occasions to meet different engineering needs. -Both indoor and outdoor, far projection distance, high laser height, clear lines. -Automatic self leveling function. Sound warning when beyond auto leveling scope. -360° rotating base with fine tuning knob, quickly identify the target. Thickened metal base provides stable support and it is shockproof. -Water/dust resistance ensures you work well in hazardous working environments. -Waterproof, wear-resisting and feel exquisite, easy to operate. -Wide applications for auxiliary tiles fixing, wall decoration, floor tiles fixing, stair handrails, furred ceiling, floor tile, plasterin -Easy to carry with the case, providing quick and convenient mobility and storage.