Bluetooth AUX Adapter with MIC for Car and Audio Stereo Speaker, 3.5mm Plug Music Receiver It's a 3.5 mm plug in Bluetooth adapter for receiving music ( audio ). An option for car does not have Bluetooth We usually plug it to AUX jack equipped headphone, mixing amplifier, speaker or home stereo system There is a microphone in Bluetooth for hands-free talk ( phone calling ) Simple to use: make Bluetooth pair with iPhone Samsung phone or tablet, and play Remember to charge it after 7 hours playing. it's wireless receive range is 16 feet