Press any key on the touch-sensitive panel to hear sound bars playing the video soundtrack. Press the Bluetooth button and the 1725M-BT becomes discoverable to pair with a phone or other Bluetooth media player. Once paired, Bluetooth audio plays through the selected sound bar until the timeout, or until you unpair your device. To switch to TV sound the touch panel sends a command to the media player to switch its audio output from optical to HDMI. The 1725M-BT may be operated by push-buttons, but a custom control panel adds a centralized interface for selecting sound bars, comparing sound bars to TV speakers, and activating the Bluetooth feature. Call more information about customizing your control panel graphics and functionality.