Will the USB input on the back of unit both play and charge my portable music device?

The KMC 3’s USB input will only charge most portable music devices using the cord that came with the particular device. Music devices without a Bluetooth feature can be played on the KMC 3 by connecting a 3.5mm to 3.5mm cord between the device’s headphone output and the KMC 3’s 3.5mm input on the rear and then changing the source on the KMC 3 to its 3.5mm input. USB charging occurs when the KMC 3 is on either AC or battery power but NOTE that charging a device while the KMC 3 is running on battery power will significantly shorten battery life. We recommend only charging your device for a short time period and only when absolutely needed when the KMC 3 is on battery power.