iConnectAUDIO2+ can normally be bus powered by a computer attached to USB Device port 2.
However this external power supply is required for optimal operation with iOS devices.
For mio4 this power supply allows stand alone operation and powers the USB Host port
This can also be used as an additional or replacement power adapter for mio10.
Please use only the iConnectivity 9V/18W center positive supply, or you risk damaging the device.
*Does not support iConnectMIDI2+