The new version Micro JR bay case (13.5*6.5mm USB port housing compatible with most USB Type-C cables) and cooling fan are sold separately now and you can make your own TX module easily.
BETAFPV Micro RF TX module is based on the ExpressLRS project, an open-source RC link for RC applications. ExpressLRS aims to achieve the best possible link performance in both speeds, latency, and range. This makes ExpressLRS one of the fastest RC links available while still offering long-range performance.
We have tested the temperature. With 500mW maximum RF output and 30 minutes powering on, the temperature of the RF chip can be kept under 50 degrees Celsius and about 30 degrees for the case. It proves that the module can perform properly in daily use and need not worry about the temperature. Also, for the black version (maximum 1W), the temperature can be kept under 65 degrees, with a heat sink in our testing. Results are also showing that the temperature of the RGB LED would be 10 degrees higher for both 500mW and 1W RF module. This is the reason why the cooling fan component is needed in this situation.
There are also questions raised should the fan be blowing air inward or outward. Our testing results show that the only temperature difference would be shown on the JR case, as the electronic components inside remain unaffected.
Now the STL file for this 3D-printed case is released and free to download on our website for the ones who want to modify their case.
Link to STL file: