Materials of manufacture: aluminum and reinforced plastic Battery: 3.7V 7200 mAh Operating time: 5-24 hours Charging time: 4.5 hours Sound level: 30-40 dB Power level: 1.3 - 4.8 watts Charging voltage DC 5V / 2A Air flow velocity 2.3-4.0m/s Steering angle 180 degrees Operating time: 5-24 hours Easy to carry and store 7200 mAh large battery capacity Easy to use anywhere on the desk or the floor Runtime up to 24 hours 4 modes of airflow Up and down angle up to 180 degrees adjustable height Remove the front to clean from dust To clean, wipe with a dry cloth Do not wash the fan with water