EFFICIENT OPERATION: Only takes about 4 seconds to cut a log with a diameter of 3" (the specific value varies with the actual size and hardness of the wood). LARGE CAPACITY BATTERY PACK: 21V removable and rechargeable battery delivers fade-free power with no memory loss after charging. ONE-HAND USE: Due to its lightweight and soft anti-slip handle, women are easy to operate and will not be tired after working for a long time. UPGRADED COPPER WIRE HIGH-EFFICIENCY MOTOR: Provides your tool with longer run-time, more torque, and more power which leads to less wear and tear, extending the life-time of the tool. EXTRA 2PCS HIGH WEAR-RESISTANT CHAINS: Adopts a high-quality guide chain that has undergone a deep quenching process to ensure smoother cutting and more wear-resistance. B092VSFBZS