Britelink Bluetooth Audio Receiver: Portable, Bluetooth Music Receiver with Stereo Output (3.5 mm) for Home and Auto Stereo Systems -- By CyberTech Works with the speaker or home/car stereo system which has 3.5mm line-in jack Play music from Bluetooth A2DP enabled mobile phone and other Bluetooth A2DP audio devices. Compact design Build in battery, up to 12 hours working time, 230 hours standby time.