Made of high quality , more durable.Made of aluminum , anti-corrosion, anti-oxidation, good thermal conductivityBased on CM4 motherboard design, matching the size and positioning holes of CM4, fast heat dissipation CM4 dedicated fan Body type fan is more convenient, more space-saving, low noise, strong practicability, with cooling stickersThe design is reasonable and does not affect the antenna installation.Conventional: fan embedded, PWM speed regulationInterface: 4-wire PWM speed control fan interfaceRated speed: 800010%RPMElectrical parameters: 1.62W (12V, 0.1350.02A)Applicable model: For CM4Note: Not Include Compute Module 4 BoardColour:black:MetalSize: 55 x 40MM Package Contents:1 x Heatsink4 x Thermal Pad1 x Screwdriver1 x Screw PackOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.