With the app "SFR-1 Controller", the sound speedcontroller SFR-1, SFR-1-D and SFR-1-HL can be controlled via Bluetooth. This requires the Bluetooth module BTC-1, which can be ordered in our online shop:https://www.beier-electronic.de/modellbau/produkte/btc-1/btc-1.php With the app, the model can be driven (throttle and steering) and all available functions (additional sounds, WAV player, lights, servos, etc.) of the SFR-1 series can be controlled. Also a parallel operation of a standard RC transmitter and Bluetooth control is possible at the same time. Functions:• Throttle and steering via position sensor of the Android device• Throttle and steering via touch control in the directional pad• 20 freely assignable buttons• 30 freely assignable buttons, if you do not want to drive via the app. Like a graphical multiswitch module• Buttons can be labeled arbitrarily• Buttons with or without memory mode• Volume adjustment• Model memory for any number of models