The Lepai has two sets of stereo inputs on the rear panel: one 3.5mm minijack and one set of RCA (red/white) jacks. Note that the LP-2020A+ doesn't have an input selector. The RCA and 3.5mm inputs are both on all the time, so if, for example, you had your TV and iPod hooked up and turned on at the same time you would hear both of them over the speakers connected to the amp. That's no big deal -- just turn on only the source you want to listen to. Alternatively, if you're using a PC as one of the inputs, you may well appreciate the always-on inputs, since you'll be able to hear the computer's alert sounds mixed in with the second audio source.