[High-efficiency Brushless Motor with Smooth Cutting] The built-in control circuit board has an overload protection function, and the motor automatically stops working when it overheats, which makes it more secure and safer to use. In addition, it adopts a high-power brushless motor with very strong power. Cutting efficiency is higher and faster. With a speed of 29.7 feet per second, the chain saw takes only about 8 seconds to cut a 10-inch diameter log, just like cutting butter! ?1*Large Capacity Battery Pack and High Stiffness Chain?V-MODEST Cordless Chain Saw is equipped with a 1 X 21V voltage 4000mAh high capacity battery pack, which provides longer battery life and more power with about 60 minutes of continuous use. 40 cuts on one branch is enough. Charging time is only 1 hour. Carefully equipped with 1 replacement battery, you can use it outdoors without any hassle, portable and low energy consumption. Also comes with a for Milwaukee battery pack converter, you can install Milwaukee 18V battery to use. [Safety First! All-round safety upgrade?This battery chainsaw has 5 safety designs to make the mini chainsaw safe enough: ? Safety and security brake guards:The chain recoil brake handle is primarily used for recoil. The chain brake guard stops the saw immediately in the event of a recoil. As long as the chain brake is engaged, the saw will not even start, thus reducing the risk of injury. ? Splash guard: to prevent debris from splashing; ? Safety lock: to prevent accidental startup and injury; ? Anti-slip handle: to prevent the mini sawmill chainsaw from falling out of your hands; ? Full-wrap design handle: to prevent accidental injury to your hands during the cutting process ?Operating Portable and Lightweight? The chainsaw is small in size, comfortable to hold and lightweight in position. It is ergonomically designed. It is easy to use for women and the elderly, and you won't feel fatigue after using it for a long time. Even beginners can easily operate and control it. One of the biggest advantages is that it can fit into tight spaces where traditional large saws can't. User friendly for weak or arthritic wrists! ?Compact and Portable?12'' top handheld chainsaw is designed for ease of use and portability, allowing you to tackle any outdoor cutting task with convenience. Self-pumping oil lubrication system improves cutting pleasure