Update content - Bluetooth 4.2, better compatibility and less packet loss than 2.1. - Orange color display lamp enhances visuality. - EQ sound effect enhances tone quality in the car. - Dangling transmitter enhances reduction degree basic sound pickup effect that creates more authentic voice. Specifications: Color: As pictures show Bluetooth version: V4.2 USB output: 5V/3.4A Transmit distance: about 5m Microphone effective range: about 0.5-2m Product input: 12-24V Music format: MP3 WMA Working current: 40mA Standby current: 40mA Screen specifications: blue LED digital display Diameter: about 34mm Length: about 78.4mm Features: Support A2DP, AVRCP, HFP. Wirelessly transmit phone call from Bluetooth mobile phone to the car FM stereo system. Switch to hands free model automatically from music playing status when receiving call. With A2DP function, stream music from Bluetooth device to cars FM stereo system. Supports music playing from USB disk. Supports MP3/WMA format files. Draws power from th socket in the car. Dual USB outputs 5V/3.4A, charges , , iPod and other devices. Full 206 channels optional from 87.5-108MHz. LED display the number. With voltage dection to remind your car battery health status. Incoming call number announcement. Redial the last call. How to use: Plug the FM transmitter into your vehicles lighter. Tune your radio to an unused FM frequency, then match this kit to the same frequency. Activate your phones Bluetooth function, then search new device. When the phone detects a unit named "C26S", please press it to connect. This device is equipped with memory function, once connecting successfully, you do not need to connect again. Package Includes: 1 * Bluetooth FM Transmitter 1 * User Manual