Ailik Wireless Portable Bluetooth v4.0 Music Receiver Adapter W/ A2DP Technology for Audio Devices W/ A 3.5mm AUX-IN Port(Home Stereo ,Portable Speakers , Headphones,Car Music Sound Systems,More 3.5mm Media Devices)-Black+blue Connect your phone or other smart device to your stereo or music system wirelessly Bluetooth enabled for wireless connection to 900 million compatible devices High Definition audio enabled for the best audio experience Latest CSR Bluetooth V.4.0 + EDR, Calss2