You can store or memorize up to eight Bluetooth source devices with your speakers and activate two of them at the same time. (You can only stream from one Bluetooth device at a time.) To switch between two Bluetooth devices, pause the current streaming device, and then play from the other connected device. You should be able to listen to audio from your second Bluetooth device.
NOTE: When you turn the speakers on, they will reconnect to the last device you connected to.