1.Noise isolator included: In most cases， the sound quality is excellent. But， if you are bothered by the buzzing noise， you can use the noise isolator to avoid it.2.High-Speed Charger: 2 port USB output， 1A output for the receiver and the 2.4A output for other devices， it can even charge your iPad at full speed.3.Hands-free: Answer phone calls and voice activate from Bluetooth-enabled phones while on the go. Just a single press.4.Auto-on & Auto-connect: The receiver will power on automatically when you start the car， then auto sync with the last connected phone (please make sure the Bluetooth of your phone is turned on before starting the car).5.Enjoy your favorite music from phone/tablet/MP3. Stream audio through 3.5mm input in car stereo， such as music， GPS voice navigation， and podcast.For Optimal Use: We recomment that you buy a Ground Loop Noise Isolator which can enable a better Sound quality when working together with Mpow Streambot One Package included: 1 x Mpow Streambot One Hands-Free car kit 1 x Car charger 1 x User manual How to use: 1. Fix the receiver on the best position of the car. 2. Connect the receiver to the Aux-in jack of the car stereo system. 3. Connect the receiver to the car charger. 4. Plug the car charger into the cigarette socket. 5. Pair the receiver to your smart device. 6. Adjust the car radio to Aux in mode. 7. Now you can enjoy your music through the car stereo system.