From the manufacturer
ANTI-BLOCKING SYSTEM FOR CONTINUOUS CUTTING
If a branch is not cut through on the first attempt, the tool changes the running direction of the blades. This Anti-Blocking System thereby facilitates uninterrupted cutting when other hedge trimmers are ready to give up. This makes cutting quicker and more efficient than with comparable products.
•Battery voltage/type: 18 V
•No-load stroke rate: 2600 min-1
•Stroke length: 20 mm
•Weight (with battery): 2.5 kg
•Tooth spacing: 20 mm