AUKEY FM Transmitter Bluetooth, Wireless Car Kit with Handsfree Calling and Flush Fit Dual Port 4.8A Car Charger for Mobile Audio Devices. Wireless Upgrade: Instantly add wireless audio to your existing car stereo system, and listen to your favorite songs and podcasts from your smartphone, tablet, and other devices using in-car FM radio broadcast Audio Freedom: Tune into your own personal radio station on the road. Play any audio with your vehicle FM radio Hands-Free Calling: Built-in microphone for hands-free phone calls over your car stereo system speakers Handy USB Charging: Includes a dual-port AiPower car charger to power this transmitter and charge your smartphone, tablet, and other USB-powered devices at up to 2.4A per port Package Contents: AUKEY BT-F4 Wireless FM Transmitter, Dual-Port Car Charger, Sticker Base, User Manual, 45-Day Money Back Guarantee and 24-Month Product Replacement Warranty Card