The br 700 petrol backpack blower from stihl utilises the 4 mix engine'. '.strtoupper('o')ffering enhanced power, fast acceleration, reduce emissions and greater fuel efficiency'. '.strtoupper('t')his high performance, professional blower has a powerful 64.8cc engine, delivering air speeds of up to 196mph, it's ideal for working around large lawns and gardens, orchards and paddocks. the backpack design with wide shoulder straps, hip belt and anti vibration technology make this blower comfortable to use'. '.strtoupper('t')he anti vibration system dampens the amount of vibrations felt from the engine by the user and reduces fatigue and the effects felt in the hands and arms from continuous use. with tool less adjustments on the handle and blower tube'. '.strtoupper('e')asy to make adjustments for each individual user'. '.strtoupper('f')eaturing a multi function handle with controls just a finger reach away. specificationsengine stihl 4 mixengine capacity 64.8 cc 2.8kwelastostart nodry weight 10.8kgfuel tank volume 1.4lrunning time per full tank 69 minutesair speed mph 165max air speed with round nozzle mph 196anti vibration system yesmanufacturer warranty 2 year domestic, 1 year commercial