Genius Audio GDSP-31404A Manual Del Usuario página 61

(6) Key
USB / MUSIC function of the device and you want to switch to Bluetooth
Music mode and connect it with your mobile device, press the BT key for a
second and you will automatically enable this function, just follow the steps
of pairing the mobile device with the DSP device as described in point 6.4.
(7) Key
GDSP-31404A
Genius CarAudio
"BT", If you are using the DSP device in normal mode or in the
"CD/AUX" – Not enabled.
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