Direct connect your device to car or home stereo with AUX-in. Retractable design No MESSY wires in your car, home or purse. Perfect for smartphones, iphone, ipod, Zune, CD player, cellphone, tablet, computer etc. Play your music through car stereo speakers. Pocket sized Retractable Design. NO Static. Better sound quality than transmitters. Make sure your car has the 3.5mm AUX INPUT JACK.