Made of high material, more durable. Made of aluminum alloy material, anti-corrosion, anti-oxidation, good thermal conductivity Based 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 stickers The design is reasonable and does not affect the antenna installation. Conventional: fan embedded, PWM speed regulation Interface: 4-wire PWM speed control fan interface Rated speed: 800010 percent RPM Electrical parameters: 1.62W (12V, 0.1350.02A) Applicable model: For CM4 Note: Not Include Compute Module 4 Board Colour:black Material:Metal Size: 55 x 40MM Package Contents: 1 x Heatsink 4 x Thermal Pad 1 x Screwdriver 1 x Screw Pack Only the above package content, other 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.