Integrated, temperature-controlled cooling fan that connects to the fan connector on for 5 Improves heat transfer from the processor Easily removable lid exposes fan and breakout slot for cables and GPIO Integrated mounting features allow for case stacking HATs can be mounted to the enclosure with stand-offs and GPIO header extenders Input voltage:5V DC supplied via four-pin fan header on for 5 Fan speed control:Pulse width modulation control with tachometer Maximum airflow:2.79 CFM Maximum fan speed:8000 RPM +/- 15% Due to different batches, the printed words on the product be different, which does not affect use. Colour:Red & White Material:ABS Package Contents: 1 * Heat Sink Enclosure(with cooling fan) 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 a little different from the real thing. The measurement allowed error is +/- 1-3cm.