Hedge trimmers cut using either a single-action, where only the top blade oscillates, cutting against the lower blade, or a double-action where a pair of double-sided toothed blades that slide back and forth at high speed so you can sweep across in both directions.

Mains based trimmers provide a clean light weight option with the convenience of immediate and continual use. However you may be restricted by cord length - not ideal if the hedge is a long way from your power source and having a cord can be obtrusive and dangerous.

Can be used anywhere, there's no cord so they're safer, these models are perfect for heavy duty hedge trimming.