Universal 3.5mm Bluetooth Audio Receiver with Microphone Make your car stereo, home stereo, wired headphones, speakers, or any other device with a 3.5mm audio input Bluetooth-enabled! This universal Bluetooth audio receiver features an integrated microphone that lets you take calls without taking out your phone from the pocket. The Bluetooth 4.1 receiver boasts an AUX female port but also comes with 3.5mm to 3.5mm audio adapter that allows you to connect it with any device with 3.5mm interface.