Model number: 81451 Chain saw Displacement: 45cc Length of guide bar: 18" or 20" Certificate: GS,CE,EMC,EPA,EU1,EU2 Specifications: Model ... type DiaphragmaticStarting systemRecoiled, iuauelFuel mixed ratio 25:1Lubrication type, saw-chainAutomaticEngine oil tank capacity0.21LFuel tank capacity0.39LLength of guide ... save more gas, more longer time for use. 45cc gasoline chain saw, GS,CE,EMC approved