WickedHD Universal Car Wireless FM Transmitter with Built-in USB Car Charger for MP3/Smartphone/Etc. - Unlock Your Car Stereo for Use with Any 3.5mm Audio Device and Charge on the Go - Universal Transmitter Supports All Major Phone & MP3/MP4 Player Brands Including iPhone, iPod, Sony, Samsung, HTC, Motorolla Droid, Nokia, Blackberry, and More - FREE US Warranty Service Included Play music from your portable audio device on your car stereo. By broadcasting to an unused FM station frequency, you don't have to settle for listening to your portable music on a phone or bluetooth speaker! Built-in USB car charger: the unit's USB port allows you to charge your devices with the car cigarrette lighter even while playing audio through the car's FM radio. Easy to use: simply insert the unit into the car's cigarrette lighter adapter, find a static FM radio frequency, set the car's radio and the unit to that frequency, and plug into the headphone (3.5mm) jack. Now you can play your portable audio device through your car's stereo system! Also for hands-free speakerphone calls. With your smartphone connected to this transmitter, you can ditch your bluetooth headset while driving and instead listen to calls using your car stereo. Includes US Warranty and US Support guaranteed for a full year from purchase, exclusively by Foscam Digital Technologies. Enjoy peace of mind knowing that if the unit you purchased ever becomes defective then it will be replaced prompty out of our US based operation.