free your hand for driving and enjoy driving with Hands-Free Car Kit, use a micro SD card to listen to your favorite music while your phone is charging with fast charge. Porodo product comes with Dual USB ports that enable you to charge multiple devices at the same time as well as play music. This FM transmitter car charger is equipped with charge 15W USB-A power delivery. You can charge any of your smart devices including the latest iPhones, tablets, iPads, etc. It supports MP3, WMA music format and you can adjust Micro SD card up to 32GB. Hands-Free Calls: You can answer your calls or call someone because of this FM transmitter. Micro SD Card: Porodo Wireless Hands-Free Car Kit Supports flash drives and Micro SD Card both up to 32GB. You can make your own playlist and listen to your favorite music while you are driving and make the driving interesting for yourself especially while you stuck in the traffic and during rush hour. Built-in protection: Porodo Wireless Hands-Free Car Kit has been designed to protect your phone from any kind of damage like over-current, overcharging, short-circuit, and overheating.