This board features 433MHz transmitter and receiver. IR leds are placed in circle to cover all the directions. It includes a temperature & humidity and an ambient light sensor. Furthermore you can power and program it through the USB TYPE-C, ESD protected. This board is based around the ESP32-WROOM-32E, so it's super easy to set everything up with ESPHOME and controlling it from Home Assistant.
The board is really small. It fits everywhere It is only 5cm (diameter) x 3cm (height) without the enclosure. This is the comparison against the broadlink rm3 mini, the only device I have as reference
In this repo you can also file the two stl files of the enclosure, so you can print it yourself choosing the color according to where you want to place it!
The already designed one has some openings near the usb-c and the two built-in sensors, to improve the air flow to cool down the temperature sensor. The top part is screwable, so you don't need screws or other components.
I only tried printing with light colors PLA and the IR transmission was not affected at all. I can't say anything about other materials or dark colors