Features: Keep your device cool and running smoothly with our temperature controlled fan! The PWM temperature controlled fan can be plugged into the 4pin PWM fan connector located between the 40 pin GPIO connector and the USB2 port in the upper right corner of the circuit board. Specially designed for efficient cooling, our fan adjusts its speed based on the device's temperature.For RPi firmware will automatically adjust based on the temperature of the mainboard CPU As the temperature for RPi increases, the fan will react as follows: belows 50°C, the fan will not rotate at all (0% speed). When the temperature reaches 50°C, the fan will rotate at low speed (30% speed). When the temperature reaches 60C, the fan speed will increase to medium speed (50% speed). When the temperature reaches 67.50°C, the fan speed will increase to high speed (70% speed) and the temperature will reach 75°C. , the fan speed increases to full speed (100% speed) The fan does not rotate at low temperatures, which is a normal phenomenon； The shipment does not include fixing screws, and you need to bring your own fixing screws Specifications: Material: Plastic Fan Type： PWM Fan Power current: 0.26 Power supply voltage: 5V Power: 1.3 W For RPI5 Item Types：A:2507 Fan/B:3007 Fan/C:2507Two Fans/D:4010 Fan Package Includes: 1 PC PWM Fan note: Due to the problems of lighting effects and shootingangles, there will be certain tolerances in the product, please understand. Please allow 0-1cm error due to the manual measurment.