EarFun UBOOM L User Manual page 7

Notes:
Turn on the video mode can drop latency to about 150ms and improve video watching
experience, but it will shorten the connection distance. We suggest you turn off the
video mode when you use the speaker for playing music.
Video mode does not support the True Wireless Stereo connection mode.
The normal mode provides latency about 250ms.
Bluetooth technology can not fully eliminate the latency of Bluetooth audio.
8
Reset and Reconnecting
If this speaker becomes disconnected or has another connecting problems, you can
simultaneously press and hold "Volume +" and "Volume –" buttons simultaneously for
5 seconds at least to remove all paired devices from the speaker and remove the old
pairing of speaker in your Bluetooth device, then pair again.
5s
If this speaker crashes, you can try to press and hold the power button for 8 seconds
at least to reboot. Also, you can directly put a straightened paper clip or similar item
into the reset hole and depress the internal button to reset speaker and power on
again, and the reset hole is located at the back of the speaker.
RESET
8s
06