feature of product Easily upgrade your car stereo to a Bluetooth hands-free wireless speaker Play music on your smart phone, iPad, iPod, and other devices with Bluetooth products, you can wirelessly play music from your car stereo back to your smart device You can browse the music list on your smart device at will within the range of the car and select your favorite music to play/pause; play/pause; play; play; play; select music, hands-free answering and other operations Up to 90dB signal-to-noise ratio and 0.05% ultra-low audio distortion, fully meet your needs for high-quality audio- Supports Bluetooth hands-free function, you can answer any call while listening to music Supports all car stereos with AUX input Support up to 5 mobile phone connections, and give priority to the last paired mobile phone