Specification: Material type: ABS Product type: FM transmitter Voltage: 12 to 24 v Features: Hands-free Product size: 4.5 * 3.5 * 7cm (Due to manual measurement, there will be an error of 1-3cm.) Support auto voltage display: remind low voltage Support for hands-free calls: Bluetooth hands-free Built-in microphone: hands-free talk car kit Bluetooth FM transmitter: Emitter FM Bluetooth Feature: 1.Accurate structural design. 2.Usb 3.1A Charger, Bluetooth version 5.0. 3.Charge for listening. 4.Support power and storage functions. 5.The screen can display frequency. 6.Support Bluetooth/TF card/USB player and Bluetooth hands-free communication 7.This product adopts FM full-frequency wireless transmission technology, which can directly read the audio files of the bluetooth/TF card/U disk of the mobile phone. Supports Bluetooth audio playback and Bluetooth hands-free calls. Support intelligent APP function, lossless high-quality audio decoding; Multi - functional MP3 USB car charging function. 8.Noise cancelling function, built-in noise cancelling circuit, make the voice clearer. Package Including: 1PC Car Charger ?High Quality Bluetooth Transmitter? - More stable FM signal, better anti-interference performance, improved sound experience and built-in microphone with echo cancellation and noise canceling (CVC) technology, Bluetooth FM transmitter can provide you with hands-free calls and wonderful music. ?Wide Compatibility? - This bluetooth car FM transmitter is compatible with most bluetooth enabled devices, such as iPhone, iPad, tablet, Samsung, HTC, Sony and other Android smartphones; It can stream music directly through FM broadcast signals Make calls from mobile devices to car stereo speakers. ?Easy Charging? - With two USB charging ports, you can fully charge the device in a short time. The power source is from the cigarette lighter, so it is suitable for most cars. ?Stable Bluetooth Connection? - The bluetooth car adapter solves the problem of noise and interference in the same channel when using the hands-free calling function. Now you can make hands-free calls quickly and easily from your phone without interference. ?Range and Compatibility? - The Bluetooth transmitter is fully compatible with most smart phones and other devices with Bluetooth functions. When turned on, it will automatically connect to the paired bluetooth device it remembered.Note: English instructions are attached outside the box, please check carefully.