The SpeedyBee Bluetooth UART Adapter helps you configure your flight controller settings directly from your phone or tablet without having to plug into your computer every time. The Bluetooth signal also shuts down when your throttle is armed so that there is no interference during flight. As soon as the throttle is disarmed, the signal activates automatically.
Once you download the SpeedyBee app (requires at least iOS 10 or Android 4.3+) you will be able to tune your quad through the Betaflight configurator. The app also supports CLI and PID settings.