What further features and functions might I find on a petrol chainsaw?

Automatic Chain lubrication
Tool-less chain tensioning
Auto-tensioning (dial)
A ‘name’ Guide bar and Chain (e.g. Oregon)
Ergonomic design for comfortable operation
A chain-oil level indicator
Cable strain relief
An integrated sprocket on tip of bar to decrease friction and reduce power loss 
Kickback reducing teeth/anti-kickback chain
A magnetic guide bar attachment
An inertia-style chain break  
Mechanical and/or electronic-overload protection
A longer chain bar (20”) and faster chain speed on more powerful models
Anti-vibration dampers
Fully automatic chain-tensioning
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