Features: 1. The official new upgraded case for 5 adds a new function to support the cooling fan in the appearance of the previous generation 4b. 2. Integrated 2.79 (maximum) Cfm fan uses hydrodynamic bearings for low noise and long life. 3. Connects to the 5's four-pin Jst connector to provide temperature-controlled cooling. 4. Air is drawn in through the 360-degree slot under the lid and blown through the heatsink connected to the Bcm2712ap. 5. Exhaust through the contact openings and vents in the base. Description: 1. Input power supply: 5V DC powered via the dedicated fan's 4-pin pin on the motherboard 2. Fan speed control: Pulse width modulation control with tachometer 3. Maximum airflow: 2.79CFM 4. Maximum fan speed: 8000RPM +/- 15% 5. Material: ABS+PC Color: red and white Package contents: 1 x Red and white shell 1 x Cooling fan 1 x Heatsink 4 x Gaskets 1 x English manual Note: Different batches may have differences in product appearance, color, and printed characters, which does not affect use Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture to be a little different from the real thing. The allowed measurement error is +/- 1-3 cm.