Beside the mentioned CD-Player, Bluetooth-Streaming and the integrated Radio Tuner, you can also connect external Music-Players via a 3.5mm Line-In connector. Also Headphones can be connected through the relevant connector directly beside the Line-In.
On the backside of the Boomblaster you can find connectors for a Microphone or for a Guitar. Both with a 6,3mm jack and both individually controllable.