[Safe and Reliable]:GTHAN Gas Chainsaw is designed with dual throttle switches, which need to be pressed at the same time to start, which can effectively prevent accidental starting. The high-quality brake baffle can make emergency braking, which can effectively protect your hands and  your safety during use. [High Powerful Engine]: Gas chainsaw is equiped with the latest 2-stroke cycle engine, which is high efficiency, high power, reliable work, and long life.The average specific fuel consumption of the engine is lower than that of the original engine by about 20%.The chainsaws Suitable conquer tree felling, wood cutting for lumberman’s in the forest or other use. [Automatic lubricating System]:GTHAN 20″ Gasoline Powered Chain Saw Equipped with an automatic  system,to prevent the dust from entering into the engine,reduced fuel consumption. Automatic lubricating system, reduces the friction between the quiding board and the chain, prolongs using life.(Note :some oil will residue on chains and back flow on the bottom of clutch then drip oil. This is a common phenomenon for all kinds of chainsaws, not defective). [Easy to Install and Use]This Chainsaw is easy to install in minutes. Spring-assist pull cord combined with easy-to-use knob  fast, this simple start system make pull starts easier to rev up and get right to cutting. Notice to avoid “NOT START ISSUE”: 1. Using the recommended oil ratio: Gasoline 25: Two-Cycle Oil 1. 2. Make sure that you pull the switch up at first. 3. Pull the choke knob before it start, please check the operation introduction in the product manual [Warmly Service]: GTHAN Gas Chainsaw has the advantages of high power, high efficiency, small size and light weight.You could contact us to solve your problems,like Technical Support,Missing parts,Damaged Parts,Parts wear and tear and so on.If there is something problems with accessories ,we will sent you a new parts.