Fosi Audio BT05, User Manual

10. What’s the function of the LL/HD button on the rear 
panel?

• If your Bluetooth device supports both aptX/aptX-LL/aptX-HD 
  audio, you can switch between audio formats by long press the 
  LL/HD button. The aptX-LL for low latency audio and the aptX-HD 
  for high definition audio.

11. Why does the LL/HD button of my BT05 not work?

• Some Bluetooth devices support aptX but not aptX-LL and 
  aptX-HD, You cannot switch the audio type to aptX-LL or aptX-HD, 
  so the LL/HD button will not work.
• Please check if your Bluetooth device supports 
  aptX/aptX-LL/aptX-HD audio, or consult the supplier of this
  Bluetooth device for more support. 

12. Can it be used as a converter from optical input to 
RCA output?

• Yes, you can switch to bypass mode to convert the optical input 
  to the aux/3.5mm output and use an additional 3.5mm to RCA 
  cable for your purposes.

13. No sound playback from Bluetooth headsets/Bluetooth 
speaker in optical input mode on TV or other devices?

• Please ensure the BT05 is in transmitter mode.
• Please ensure the optical cable connect to BT05’s TX OPTICAL 
  interface.
• Please ensure that the TV or other devices are turned off Dolby or 
  DTS sound etc., BT05 does not support Dolby or DTS sound, 
  please select RAW/PCM sound.
• Please check if the Bluetooth headset or Bluetooth speaker is 
  muted.
• Please check if BT05 is muted by mistakenly touching the power 
  button.

6. Can I use 2 Bluetooth headsets/devices at the same 
time? For example, when watching TV with two     
Bluetooth headsets?

• Yes. The BT05 can connect two Bluetooth headsets at the same 
  time, please follow the quick setup in transmitter mode strictly for 
  two Bluetooth headsets pairing, please pair the two Bluetooth 
  devices in order.

7. Can it transmit and receive at the same time?

• No, you can only be in transmitter mode or receiver mode, or 
  bypass mode.

8. Why does the "APTX", "LL" and "HD" of the device not 
lighting up?

• Please ensure that your Bluetooth device supports 
  aptX/aptX-LL/aptX-HD audio or that the Bluetooth device 
  aptX/aptX-LL/aptX-HD functions is turned on. Otherwise, you will 
  not be able to use the features and “APTX”, “LL”, “HD” will not 
  light up. Please consult the supplier of this Bluetooth device for 
  more support.

9. Can't get higher aptX audio (aptX-LL/aptX-HD) when 
connecting two Bluetooth devices and the devices 
themselves support it?

• Please ensure that both Bluetooth devices support 
  aptX/aptX-LL/aptX-HD audio, otherwise the 2 Bluetooth devices 
  output will be output with the lowest audio type. For example, if 
  device A support SBC but not aptX, and device B supports 
  aptX/aptX-LL/aptX-HD, then the 2 devices will output SBC audio.