Ugreen 70601 Series Transform your home or car audio system to Bluetooth wireless, the world's tiniest music receiver, and stream crisp, high- quality music from your smartphone or tablet. Talk With Clarity Hands-free calling with the built-in microphone makes catching up with friends a breeze. Connect the Audio port with a 3.5 mm AUX plug. Connect the power port with a USB plug. Turn on the Bluetooth in your cell phone, then click to pair, which allows you to enjoy your music wirelessly. Bluetooth devices: smartphones / tablets / laptops Audio devices: car radio / home stereo system