You can use this dongle to transfer music from your mobile to a music system if the music system is Bluetooth-enabled. The dongle makes it possible to receive Bluetooth signals from your mobile and forward them to the music system, provided the music system supports Bluetooth input. However, the dongle is designed as a transmitter, which means that it usually sends signals from one device to another, not receives them. Therefore, it may be necessary to use the music system as a receiver if it supports Bluetooth input.