Sangean U4 DBT (V1) - Manual (Page 28)

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3) If ‘U4 DBT” shows in your Bluetooth device list but your device
cannot connect with it, please delete the Sangean U4 DBT item
from your list and pair the device with the speaker again following
the steps described previously.
4) The effective operation range between the system and the paired
device is approximately 10 meters (30 feet). Any obstacle between
the system and the device can reduce the operational range.
5) Bluetooth/NFC connectivity performance may vary depending
on the connected Bluetooth devices. Please refer to the Bluetooth
capabilities of your device before connecting to your radio. All
features may not be supported on some paired Bluetooth devices.
Playing audio files in Bluetooth mode
When you have successfully connected your radio with the chosen
Bluetooth device you can start to play your music using the controls
on your connected Bluetooth device.
. Once playing has started adjust the volume to the required setting
using the Volume control on your radio or on your enabled Bluetooth
device.
. Use the controls on your device to play/pause and navigate
tracks. Alternatively, control the playback using Play/Pause ,
Next track , Previous track buttons on the radio.
Note:
1) That not all player applications or devices may respond to all of
these controls.
2) Some mobile phones may temporarily disconnect from your radio
when you make or receive calls. Some devices may temporarily
mute their Bluetooth audio streaming when they receive text
messages, emails or for other reasons unrelated to audio streaming.
Such behaviour is a function of the connected device and does
not indicate a fault with your radio.