KingsFord Bluetooth Charger USB Outlet with LED Display, FM Radio, Hands-free Calling, AUX Input Car Kit iPhone and Android Smartphones One Year Warranty on Faulty Products Convert Your Old Car Stereo into a Bluetooth Enabled Device with compact portable design LED Display the FM frequency/track Built-in FM transmitter, full frequency: 87.5-108.0 MHz Bluetooth hands-free kit, with built-in microphone Excellent voice, use the DSP (digital signal process) technology to echo cancellation Switch to hands-free mode automatically from music playing status when receives an incoming USB charging ports for charging iPod/iPhone, Samsung, iPad, Nokia and other mobile devices (Output 5V/3.1A) Features: LED display touch screen Line audio input Independent Bluetooth on/off button Support playing music by USB disk Support MP3/WMA music format Answer/hang up/reject/redial via Bluetooth Specification: Parameters: Rated Working Voltage: 12V-24V USB Output: 5V/2.5A Play: MP3 WPA SNR: ;60db Frequency Response: 20Hz - 15KHz Bluetooth Version: 2.1+EDR Sound Processing: A2PD Function support(Advance Audio Distribution Profile) Transmission Distance: 10M Effective Distance of Bluetooth Microphone: 0.5-2M FM Frequency: 87.5-108MHz FM Mode: Stereo Digital PLL Frequency Locking.