General description This Fan Violent Blower is designed for efficient dust drying with a powerful brushless motor. It features a 3-speed wind speed setting, allowing users to adjust airflow according to their needs. The device operates on a rechargeable 18650 battery (not included) and is constructed from durable ABS material. Technical specifications Product Name: Super Turbo Fan Product Model: -02 Battery Model: 18650 (not included) Battery Capacity: 2000(ND)*5, 4.2V*5, total 21V (not included) Battery Voltage: 21V Charging Current: 1A Rated Maximum Power: 150W Charging Time: 2-3 hours Working Hours: Second gear (120 minutes), Third gear (15 minutes) Color: Black Material: ABS Measurement Allowed Error: +/- 1-3cm Usage Power on/off: Connect the battery and long press the power button to turn the device on and off. Start mode/gear switching: Manual mode is activated by long pressing the start button to blow air; release to stop. Automatic mode allows for gear switching with a click