Wide voltage adaptation, universal for two models Supports dual voltage of 24V (large trucks/buses) and 12V , automatically identifies power sources without manual switching. Adopts anti-overload circuit design to avoid voltage instability and damage to the fan, and is compatible with most diesel/gasoline models. Strong wind cooling, three-speed adjustable Equipped with a high-speed brushless motor, the maximum air volume reaches 45CFM, and the air outlet wind speed is ≥6m/s (measured distance 30cm). Two-speed adjustable wind speed, strong gear rapid cooling, suitable for the scene of rapid cooling of the rear compartment after exposure to the sun. Can be fixed to the headrest bracket, seat buckle or instrument panel to meet the needs of the main/co-driver and multiple seats in the back row. Low noise design, full-speed silent Adopts vortex air duct and asymmetric fan design, the maximum gear noise ≤45dB (equivalent to the ambient sound of the library). Driving at night does not interfere with conversation, especially suitable for sleeper truck drivers who need a quiet environment. Anti-vibration and anti-shake, safety upgrade Product name: Large truck fan Pendant material: Metal+ABS Belt Size: 11in/8in Package: 1 pcs Large truck fan