- Stepless speed control: The handle provides stepless speed adjustment. Pressing the speed button with different force lets you tailor the speed for loosening or tightening nuts. - Highly functional with forward/backward: By pressing the black button on the left or right side, you select backward or forward operation, enabling both tightening and removing screws. - Efficient heat dissipation: Multiple heat dissipation holes dissipate heat promptly to reduce noise, ensure normal operation, and extend the life of the tool. - Strong safety features: Over-current, over-voltage and over-temperature protection enhance safety. Auto stop mode stops the impact and rotation after the screw or nut is fully loosened, preventing further loosening. Use scenarios: - Automotive and machinery maintenance: loosening or tightening fasteners in engines, assemblies, or bikes where control and safety matter. - Home improvement and furniture assembly: tightening screws and removing fasteners in cabinets, shelves, and equipment installations. - General maintenance tasks: panel removal, appliance servicing, and component replacement where precise speed control and safe operation are beneficial.