Your Logitech UE Mobile Boombox can have eight devices paired with it, and you can connect to two at a time. This lets you quickly switch to another device to play audio without having to go through the connection process again. Here's how:
Connect the first paired device to your mobile speaker by selecting it from the device's Bluetooth menu.
NOTE: If you haven't paired any devices, see answer 360023411533 for help.
Connect a second device to your mobile speaker the same way you did in Step #1.
NOTE: If you haven't paired a second device, see answer 360023411533 for help.
Once you have two devices connected, you can start playing audio from either of them.
To switch and play audio from the other device, pause the current one. Then, start playing the other.