Is the A2+ Wireless designed only for use with Bluetooth devices?

The A2+ Wireless work excellent via Bluetooth, but they can also be used wired, with more traditional source devices like Turntables, CD players, or anything else with a standard analog audio connection like RCAs or 3.5mm stereo-mini. They also include a USB port for use with a Windows or Mac computer, as well as many Smartphones and Tablets with the right USB adapter cable.