The 40-bt2 is a portable bluetooth stereo receiver. The 3.5mm line output jack that can easily connect to a home stereo, PC line input for wireless Bluetooth audio playback or a home automation system for 4 discrete zones or wireless audio playback. Play music from any Bluetooth A2DP enabled mobile phone or other Bluetooth A2DP audio devices at up to 35 ft., distance may vary with surroundings. Listen to your audio in comfort without a wired connection. Includes USB charging cable, 3.5mm adapter cable. Works with USB power or by battery power.