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Specification: Power supply: 5V DC, 50mA Lithium battery: 14250 280mAh/ 3.7V Laser lines: Vertical and horizontal(cross) Wavelength: 520nm Laser class: Class 2 Laser range: Up to 20m Leveling accuracy: +-5nm Dimensions: 39x38.8x36mm Weight: 46g Built-in bubble level Magnet for fixation Note: While in operation, be careful not to expose your eyes to the emitting laser beam. It's best done in low light situations as laser would be effected by strong sunlight. Exquisite portable spirit level, which can not be compared with professional instruments in function