4D 16 Line Laser Level- Two 360 horizontal lines and two 360 vertical lines provide full, flat coverage of floors, walls and ceilings around the room. The 4D laser level provides omnidirectional leveling coverage with an accuracy of 2mm/10m, the maximum indoor working range is about 25m in diameter. 3Leveling Mode Auto Level & Tilt- Auto Level Mode: After power on, auto level mode is enabled by default. When the device is out of 3 degrees, the laser beams will flash quickly. Manual/Tilt Mode: After power on, press and hold the Open button for 3 seconds to enter manual mode, can lock the lines at any angle. Large capacity durable battery - With 2pcs 3.7V 2400mAh large capacity lithium battery, cyclic charging for environmental protection, easy charging with the included charging accessory. Multiple installation methods :1:The wall mount has a 360 rotatable fine-tuning mechanism, can make the machine quickly find the target. 2: Can be installed on the lifting platform to measure the wall.