This self-leveling laser leveling device is suitable for precise drilling and measuring tasks. You can use it for tiling, wallpapering, hanging lists, mounting cabinets, and more. The laser automatically self-levels, and the integrated degree scale provides automatic reference angles. This device projects clearly visible vertical, horizontal, or 90-degree laser lines. The laser can be used on a tripod, with wall mounting, or freestanding. An acoustic signal sounds when the leveling device is moved. The laser leveling device comes in a convenient storage case. Laser wavelength: 650 nm, laser power: 1 mW, self-leveling speed: 7 s, power supply: 2 AA batteries, 1.5 V, opening angle: 90°, battery required: Yes, number of batteries needed: 2, batteries included: 2.