FiiO Control app is designed exclusively for controlling FiiO Bluetooth devices. You can use this app to change the audio settings, equalizer and other functions of your FiiO Bluetooth device. Features: · Customize the general functions such as Charging on-off, RGB indicator light on-off, in-vehicle mode, DAC work mode, etc; · Adjust the equalizer; · Change audio settings such as digital filter, channel balance, etc. · View the embedded user guide for device introductions; Note: This app currently supports connecting with FiiO Q5, Q5s, BTR3, BTR3K, BTR5, EH3 NC, LC-BT2. The support for newer models will be added once they're available. Due to the differences in Bluetooth chips and DAC chips, the settings for each model may vary. Please refer to the menus that appear after device connection for the actual settings. ----------------------------------------------------------- If you have any questions of using this app or any suggestions, feel free to contact us using the below methods: E-mail: support@fiio.net