What main features should I expect to see on petrol hedgetrimmers?

• Lightweight and easy to handle

• A powerful, high-performance petrol engine - from 21cc for smaller

models up to 25-26cc or so for larger models

• Strong, sharp, precision-ground toothed blades

• Double-action, reciprocating blades

• A sturdy hand guard

• A reliable starting system

• Anti-vibration system 

• Good cutting length from 43cm up to 100cm or more

• A blade cover or sheath included (most models)