This professional unit replaces the HS 81 R with the latest in STIHL technology. Equipped with stratified scavenging engine technology that reduces fuel consumption by 20% and fulfils all emission regulations, long life air filter for prolonged engine protection, double-sided, sharpened cutting blades for a high quality cut, adjustable multi-function handle and a tool-less fuel cap. This hedge trimmer is an innovative unit designed with the demanding professional in mind.