This product is a temperature-sensitive fan designed for use in power distribution boxes or electronic equipment cabinets. When the surrounding temperature exceeds 40 degrees Celsius, the fan automatically starts to operate and cool the equipment, ensuring efficient heat dissipation. The fan is designed to provide optimal cooling for the power distribution box or electronic equipment cabinet, ensuring optimal performance and longevity of the equipment. Input Voltage: 5V Current: 0.5 A Ventilation quantity: 44 CFM Noise: ≈37 db Fan Size: 3.14 x 3.14inch (80x80mm）