The anti-kickback device and the chain brake guarantee that the chain will stop if the chain saw is not handled correctly or if it rebounds 2. The throttle lock is designed to keep the chain saw running only if you hold down a given button 3. Chain sensor prevents chain from falling if chain breaks or derails 4.Right hand protection protects your right hand in the event of chain breakage or derailment 5. Easily accessible stop command lets you instantly stop the chain