Suits for most smartphone and tablets. Feature: Built-in microphone provides hands-free calls while driving Bluetooth 3.0 (fully backward compatible & A2DP profile) Echo and noise cancelling CVC technology supply a more clear call quality Built-in FM Transmitter and Stereo Output Nixie Tube Display Magnetic base adapted for any type of autos Cigarette lighter car charger with a USB port(maximum output: 5V/2A) Support TF card/ MP3 /Bluetooth music play One key switch between TF card and MP3 music Power-off memory How to connect: 1. Insert the car charger into the cigarette lighter in the car 2. keep the FM transmitter and the car FM Radio at the same frequency 3. Open the Bluetooth of the Bluetooth transmitter and pair with your phone(name: Car Kit/ password: 0000) Specifications: Color: silver Supply Voltage: 12-24V Limiting Voltage: 10-25V USB Charger output: 5V/2A Bluetooth Version: Bluetooth 3.0 Working Temperature: 0-50 degree SNR: 60dB Frequency Response: 20Hz-15Khz Transmit Distance: 10M Bluetooth Mic Effective Distance: 0.5-2m Package: 1 x Bluetooth Car Kit with Charger 1 x User Manual