Bluetooth Speaker Adapter: 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, with build in microphone. Play music from Bluetooth A2DP enabled mobile phone and other Bluetooth A2DP audio devices. Build in battery, up to 8 hours working time, 150 hours standby time. Compact design, 3.5mm stereo inlet socket included. Sold exclusively by Cybertech with 1 year warranty