BOLS Bluetooth Handsfree Car Kit with (B6) Bluetooth connects to smartphone, Aux-In connects to car stereo, Keep the bluetooth receiver power on. Routes calls and music from a smartphone through car speakers,Seamlessly switches between calls and music. Connect two phones at the same time High quality PC & fine sand blasting aluminum material, imported chips, high performance data line to ensure a good signal. Bluetooth 4.1 technology, The effective distance of 10 meters. mini size design, Convenient to carry.Compatible with most of bluetooth devices. Enjoy your favorite music from phone/tablet: Scream audio through 3.5mm input in car stereo, such as music, GPS voice navigation, and podcast.