If you drive a car that doesn’t have built-in bluetooth and you’re still running the AUX cord to play songs and stream, this compact Bluetooth Receiver from TaoTronics will get you connected. About the size of a car key fob, this little device gives you instant, portable bluetooth connectivity by plugging into your AUX port. It delivers 10-hours of playback on a charge and syncs with two devices simultaneously for calls, music, even access to Siri.