Features:1. Three Row Air HoleSmooth Exhaust, Fast Heat Dissipation, Long Working Time, No Flameout.2. Thicken the Brake HandleIt Is Thicker and More Comfortable.3. Air Cooled Filtration SystemDust Particles Filtered by Cotton Screen4. High Quality Spark PlugEasy Ignition and High Temperature ResistanceOperation:1. Turn on the Start Switch2. Open the Air Door Switch3. Pull the Starter a Few Times Until You Hear "Bang Bang"4. Close the Damper5. Press up and down at the Same Time6. Pull the Throttle Switch of the Pull-down Rope Again to Start SuccessfullyAttention:The Main Function of Adding Engine Oil Is to Lubricate the Chain, so You Must Wait for the Engine Oil to Spray out Before You Can Operate the Saw Tree. the Dry Saw Will Cause Great Damage to the Chain (Ordinary Engine Oil Is Enough)Add Gasoline, the Mixture Ratio of Gasoline and Engine Oil Is 25:1 (It Must Be 2t Two-stroke Engine Oil)2-Stroke Engine Oil Must Be Used When Adding 2-Stroke Engine Oil at a Ratio of 25:1. 4-Stroke Engine Oil or Other Engine Oil Must Not Be Used, Otherwise It Will Easily Lead to Cylinder Pulling or Other ProblemsAdd More than 90 Gasoline, Gasoline and Two-stroke Engine Oil to the Same Scale, Close the Cover, and Shake It Upside down to Add It to the Fuel TankGuide Plate Size: 18 InchesBore * Stroke: 58 * 34mm (2.28 * 1.34 in)Weight: 6.5kg (14.3lb)Rated Power: 5.0kw/3.6hpMixed Oil Ratio: 25:1 (Gasoline 25, Engine Oil 1)Engine Specification: 68ccMaximum Working Speed: 13000r / MinChain Oil Tank Volume: 260mlFuel Tank Volume: 550mlMaximum Cutting Diameter: 20 "(55cm)Exhaust Volume: 7.2 (Cm3)Sawing Productivity: 50 (Cm2 / S)Packing List:File + Installation Wrench + Slotted Screwdriver +