*Sharp light source, optical lens, thin line width, clear and bright, more eye-friendly *Optimized gravity pendulum structure, 3s self-leveling *Battery pack: charge and discharge protection. Short circuit protection, high temperature protection Rubber package design, comfortable hand feeling Laser class: II Wavelength: 515nm Accuracy: ±1mm/5m Self-leveling: ±3° Leveling time: 3s Working distance: 10m Working temperature: -10℃- +45℃ Waterproof grade: IP54 Battery pack: 4000mah Full power working time: 5 hours Plastic box packaging