Operation steps:Remove the cover of guide plate protectionInstall the chain guide plate and insert the bolt into the hole of the guide plateAdjust the tightness of the chain, not too tight to slightly looseInstallation completedSpecification:Name: Lithium Chain SawColor: Red with blackChain size: 10"Chain Speed: 5m/sMaximum Cutting Diameter: 20cmWorking voltage: 21VBattery capacity: 3.0Ah rechargeable lithium battery, 10000mANo-load speed: 200m/minMotor power: about 1200WProduct advantage: super light, suitable for one - hand operationOne charge can cut 120 times.If you have any questions please contact us freely!Pacakge Include:1x Chain Saw + 2x Batteries + 1x charger Set