Features： Bluetooth:V4.0+EDR FM frequency range :88.1 ~ 107.9 MHz Frequency stability:± 10ppml Input:12-24 V USB Charger Output:5 V/3A (total) FM Operating distance:5M Supported files:MP3 / WMA Bluetooth protocol:A2DP Micro TF Card Expansion (Max.):32GB U-Disk Expansion (Max.):32GB Description： 1.3 USB Ports: Bluetooth FM transmitter with 3 USB ports, 1 port for USB music file playing; 2 ports designed for charging (both IOS and Android devices). 2.FM transmitter with Large LED display screen showed the music active,and supports AUX input, also support full frequency point to launch, range from 88.1Mhz to 107.9Mhz. 3.Widely Compatibility: Fit for compatible with iPhone (max speed)/compatible with iPad (max speed)/ iPod/for HTC/Galaxy/MP3 Players/for PDAs/Mobile Phones. 4.Better Sound Quality: Built-in Microphone, support hands-free phone calling; supports TF /Micro SD Card in FAT format up to 32G memory; supports MP3/WMA format songs only, support in-car stereo steaming; supports A2DP; support AUX Input. 5.Power off Automatically: The Bluetooth FM transmitter will power off automatically without any operation in 5 minutes (without flash drive or TF card in), you need to long press the Hang Up button for 2 seconds to turn it on again. Size chart： One size Package included： 1*Car Charger 1*User Manual Notes: 1. 1 inch = 2.54 cm 2. Please measure it yourself to choose the right size. 3. Due to the difference between the different displays, the picture may not reflect the actual color of the item. Thank you! 1.3 USB Ports: Bluetooth FM transmitter with 3 USB ports, 1 port for USB music file playing; 2 ports designed for charging (both IOS and Android devices). 2.FM transmitter with Large LED display screen showed the music active,and supports AUX input, also support full frequency point to launch, range from 88.1Mhz to 107.9Mhz. 3.Widely Compatibility: Fit for compatible with iPhone (max speed)/compatible with iPad (max speed)/ iPod/for HTC/Galaxy/MP3 Players/for PDAs/Mobile Phones. 4.Better Sound Quality: Built-in Microphone, support hands-free phone calling; supports TF /Micro SD Card in FAT format up to 32G memory; supports MP3/WMA format songs only, support in-car stereo steaming; supports A2DP; support AUX Input. 5.Power off Automatically: The Bluetooth FM transmitter will power off automatically without any operation in 5 minutes (without flash drive or TF card in), you need to long press the Hang Up button for 2 seconds to turn it on again.