Feature: 1. Adopts optical glass, fine transmission, with clearly laser light. 16 lines for finer positioning, with self-leveling system, flexibility and stability. 2. Equipped with self-test calibration function, ≤3° automatic leveling, but if the angle is over 3°, the laser light will keep blinking and also has beep sound to reminding you to reset them on a flat ground. 3. The magnetic damping compensation system ensures quick levelling time. 4. Two touching buttons design, one V button, one H/OUT button, the button is wear resistant, with high sensitive to switch the line mode quickly, and with comfortable hand feeling. 5. 1/4" screw size rotation base for easy connection, it also can be used with tripod by it's 5/8inch thread to adjust the working height of the machine and work with 180° oblique line. 6. Comes with one T type wall mounting bracket, 7mm wall mounted distance, general for indoor and outdoor use. The laser level lift bracket, height adjustable, anti slip texture design for increasing friction, more stable placement. 7. Comes with one remote controller, "V"=vertical line, "H"=horizontal line, and you can adjust the quantity of laser lines easily by press the "+"or "-" button. 8. Scanning QR code on the back of remote controller to download mobilephone APP, convenient to control the level machine(the voice control function is not supported). 9. Comes with the carrying bag, easy to carry, providing quick and convenient mobility and storage. Specification: Specifications: Name: Laser Level Main material: plastics+metal Battery : 2 * rechargeable lithium battery , 3.7V, 2400mAh (included, you will find there are two batteries inside if disassemble it) Laser ray : 360°* 4, 16 lines(4D) Wavelength: green light 520nm Horizontal/vertical accuracy: ±1mm/7m Self-levelling-range: ±3° Water resistant grade: IP54 Working distance: 10m Green light working temperature: -5℃ to 50℃ Level machine size(assemble with battery ): 153 * 95 * 158mm / 6.02 * 3.74 * 6.22in Rotation base size: 97 * 83 * 73mm / 3.82 * 3.27 * 2.87in Wall mounted bracket size: 85 * 72 * 160mm / 3.35 * 2.83 * 6.30in Iron board size: 100 * 60 * 12mm / 3.94 * 2.36 * 0.47in Platform size: 111 * 91 * 30mm / 4.37 * 3.58 * 1.18in Carrying bag size: 277 * 217 * 175mm / 10.91 * 8.54 * 6.89in Item weight: 1535g / 3.38lb . Package List: 1 * Level Machine 2 * Battery 1 * Battery Adapter 1 * Rotation Base 1 * Wall Mounted Bracket 1 * Iron Board 1 * Lifting Platform 1 * Remote Controller 1 * Carrying Bag Note: Please do not let the laser line shoot to your eyes directly.