Long ran ge and high accuracy:The instrument is equipped with a semiconductor diode with a wavelength of 635 nm (green: 532 nm) and its laser beam has a very high visibility. Easy to use, automatic levelling and manual mode:With electronic automatic levelling, you press the power button and it is ready to work within seconds. If the TK8500 is disturbed during operation, it will automatically level itself. Self levelling motor with an accuracy of ±5°. Easy to carry:The instrument weighs only 4KG, which is convenient for you to carry out and work. Charging:TK8500 rotary laser level is equipped with 4 NiMH rechargeable batteries, the batteries can support 20 hours of work. With the extra long working time you can concentrate on your work, making it simple and efficient. With 4 battery indicators on the machine, the user knows the current battery capacity and the charge protection helps prevent overcharging. Durable design and package contents: The laser tool is completely covered in TPR soft rubber, providing a soft touch and enhanced protection. IP54 water/dust resistance ensures you work well in hazardous working environments. The set comes with a hard carrying case for easier carrying and storage of the laser tools. Package includes rotary laser level, round charger, receiver (with gripper), laser target, protective glasses, remote control, remote control 2 x AAA alkaline batteries, 1.2V; receiver 1 x 9V alkaline battery.