【 Upgraded Mini Chainsaw 】 To avoid misoperation and potential risks, this small chainsaw adds a safety lock and safety bezel. The safety lock and switch must be pressed at the same time to activate electric chainsaw. The safety bezel prevents the splashing of wood chips from injuring users during the operation. In addition, LED lights are added for using easily in places where it is not clear. 【 Battery Powered Chainsaw 】 Powered by a rechargeable battery with an actual capacity of 21V 1500mAh, it is more convenient to operate than a electric chain saw that needs to be plugged in to work. Lithium-ion batteries with overload and over-temperature protection can provide longer battery life. Note: It will stop working if it is overloaded. At this point, unplug the battery and reinstall the battery can be restarted. 【 Portable Chainsaw 】 The cordless chainsaw has greatly expanded its usable range. The mini saw (including battery) weighs about 1kg and has a total length of about 13 inches. The non-slip handle design is very comfortable to hold, and you are not tired to hold it for a long time. We are also equipped with a portable storage box which is easy to storage and carry. 【 Easy installation 】 The main part of the power chain saws has been installed. You just need to install the battery and adjust the tightness of the chain. How to adjust the tightness of the chain? Step 1: Loosen the hex screw in a counter-clockwise. Step 2: Adjust the chain tightness adjusting block by screwdriver. Step 3: Tighten the hex screw in a clockwise direction.