<b>Overview</b><br> Why design this product?<br> 1. After the Raspberry Pi 4 was released, we found that the heat generation of Pi 4 also increased greatly with its performance. We have encountered many times that Pi 4 crashed due to excessive heat generation. This problem can be satisfactorily solved by use the Raspberry Pi 4 armor case with ASIN: if not use other Pi 4 external expansion board.<br> 2. At the same time, we found that various types of Raspberry Pi 4 expansion boards such as DAC+, UPS HAT, or various LCDs on the market also encountered excessive heat generation when used on Pi 4. So we try to solve this problem.<br> 3. We refer to the design of Raspberry Pi 4 armor case and simplified the design , so there is the birth of this Embedded Armor Aluminum Alloy Heatsink Radiator.<br> <br> <b>Why is it compatible with the use of expansion boards?</b><br> The Embedded Armor Aluminum Alloy Heatsink Radiator is 7mm high (designed with negative tolerance) and is equipped with M2.5*5+5 copper spacers; so the total height is 12mm, which can support most of Raspberry Pi 4 expansion boards; if you use expansion board with other height, you only need to replace the copper spacers with the right height. (If you need a special height copper spacers, please contact us.)<br> <br> The raspberry pi hat positioning hole has internal thread for easy fixing from above or below;<br> Compared to the raspberry pi PCB, the entire heat sink shrinks inward by 0.5 mm.<br> <br> <b>Features:</b><br> Only supports Raspberry Pi 4 Model B;<br> Supports to cooling down the Raspberry Pi 4 board when using the Pi 4 expansion board;<br> Equipped with a variety of screws and copper spacers; Raspberry Pi HAT positioning hole is M2.5 internal thread; (this design is convenient to fix)<br> Supports the installation of 25mm fans; Cooling fan can be added when the heat dissipation of a single aluminum heat sink is not enough, so that all heat dissipation problems can be solved.