Update content - Bluetooth-compatible 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-compatible 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-compatible 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-compatible device to car's FM stereo system. Supports music playing from USB disk. Supports MP3/WMA format files. Draws power from the cigarette socket in the car. Dual USB outputs 5V/3.4A, charges iPhone, iPad, 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 vehicle's cigarette lighter. Tune your radio to an unused FM frequency, then match this kit to the same frequency. Activate your phone's Bluetooth-compatible 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-compatible FM Transmitter 1 * User Manual hello, guys, thank you for visiting my store.There are so many useful and cheap item in our store. we will be ready to reply you ASAP.