This listing is for 2 used speakers. The Logitech Z506 Replacement Speaker Center Channel is a wired surround/satellite speaker designed for 3.0 channel systems. This sale has 2 speakers specifically designed by Logitech to replace the center channel speaker in their Z506 system and one other satellite speaker. While the speakers are untested the physical bodies appear to be in good used condition (see photos). One of the connector wires is blue and the other is green (see photos).