1、With automatic calibration function, it provides high‑accuracy and accurate measurement. 2、Due to the clearer interface, it is more concise to operate and easier to use. 3、Light weight and compact structure allow you to carry around and do the distance measurement anytime. 4、The range finder will automatically shut down after about 150s without operation, saving electricity. 5、Laser range finder is made of high‑quality ABS,which is durable and can be used for a long time. Item Type: Laser Range Finder Model: LM-40B Material: ABS Power Supply: 1 x rechargeable lithium battery 3.7V 850mAh (battery included) Measuring Range: Approx. 40m / 131.2ft Minimum Display Unit: 0.001 Laser Type: Class 2 630~670nm ＜1mW Automatically Turn Off the Laser Time: about 20 seconds Automatic Shutdown Time: about 150 seconds Storage Temperature: -20℃~60℃ Working Temperature: 0℃~40℃ Storage Humidity: 20%~80%RH Charge and Discharge Times: about 500 times Charging Specification: DC 5V ＞1A Type-C USB interface Screen: LCD 1 x Range Finder (Battery Included) 1 x Data Line 1 x Manual 1 x Tool Bag