The Sena USB Bluetooth Adapter UD100-G03 is a class 1 type Bluetooth USB adapter that offers a long wireless transmission distance of up to 300 meters by default, which can be extended up to 600 meters with a 5 dipole antenna. It is suitable for industrial or special applications due to its extended range. The adapter supports Bluetooth 4.0 and USB 2.0 and is capable of handling up to 7 simultaneous connections. [[005546|Amazon.com: Sena USB Bluetooth Adapter 300m Working Dist, UD100-G03 (300m Working Dist. Exchangeable Antenna, Bluesoleil Driver (Works with Microsoft Bluetooth Driver)), red, Black : Electronics]] # Notes It turns out the bluetooth radio stack in linux is pretty bad. A much better solution is to use an [[ESP32]], I used a $7 [[M5Stack]].