1、12‑line green‑line level meter, high accuracy, with slash function, clear control function, simple operation. 2、Can arbitrarily choose which group or groups of light to use according to change of natural light or person needs. 3、Also choose normal light (strong light) or low light (in the case of not affecting work, it can better protect your eyes). 4、Supports the use of 4pcs 5V AA batteries (not included), and a 5V external power bank can be used via the USB interface. 5、IP54 waterproof grade, with gravity pendulum, can accurately locate the vertical line, reduce errors. 1 x Leveling Meter (Battery Not Included)1 x Lanyard1 x Base1 x USB Cable1 x Manual1 x Storage Bag Item Type: Laser Leveling MeterMaterial: ABSWeight: Approx. 952g / 33.6ozWaterproof Rating: IP54Accuracy: ± 2.2mm/10mOrthotropic Accuracy: 90°±30Leveling Range: ±3°Leveling Measurement: Gravity PendulumWorking Range (Radius): 20mBattery: 4 x AA Batteries (Battery Not Included)Battery Working Time: 4.5 HoursLaser Diode: 635nm