Features: 1. High brightness green light indoor and outdoor clearly. 2. ±3degree Automatic self leveling function. Warning when beyond auto leveling range. 3. 360degree rotating base with fine tuning knob quickly identify the target.Thickened base provides stable support and it is shockproof. 4. High quality and long service life. When using the tripods diagonal lines can be struck. 5. Precise measurement and more convenient to use. Waterproof dustproof and high precision. 6. With light point design provide convenience for the construction. Power supply: 3 AA batteries(batteries not included) or AC power Include: Choice 1: 1 x 2-line Infrared level Choice 2: 1 x 2-line Infrared level 1 x holder Choice 3: 1 x 3-line Infrared level Choice 4: 1 x 3-line Infrared level 1 x holder Choice 5: 1 x 5-line Infrared level Choice 6: 1 x 5-line Infrared level 1 x holder