It is compatible with audio receivers with Bluetooth v2.1 capability, and can be easily connected via Bluetooth. The black adapter is compact and easy to use, and features a 3.5 mm jack for added convenience.
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PAC Audio iSimple Bluetooth Solutions Kit, Model ISFM23 Add a Bluetooth connection for streaming your iPhone audio to any radio with aux audio input or FM tuner. The ISFM23 is designed to connect to any radio with an Aux input via the stereo RCA connectors, or any FM radio via the standard antenna connectors. This provides a method to stream audio wirelessly into the vehicle's sound system. Add a high audio quality audio input without any visible wires in the vehicle.
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Logitech Bluetooth Music Receiver review: Forget the aux cord, this little box turns any stereo into a wireless music system - CNET