Features: – Wireless Phone Call & Audio Streaming Transmitter – Automatic Hands-Free Mode – Built-in FM Transmitter – 4-Way Stereo Music Streaming – LCD Backlight Display Screen – Incorporated Voice Microphone Cable – Detect and Display the Voltage of the Car Battery When Powered On – Full 206 Channels Optional From 87.5-108 MHz – Support Micro SD Card & Read USB Disk – Quick Siri/Google Assistant Activation – User-friendly Switch to Private Call – Hook and Loop Fastener – Hassle-free Design & Simple Plug-in Operation – Dual USB Device Charge Ports Bluetooth Wireless Streaming: – Built-in Bluetooth for Wireless Music Streaming – Built-in Microphone for Hands-Free Calling – Compatible with All of Your Favorite Bluetooth Devices – (iPhone, Androids, Smartphones, iPad, Tablets, etc.) – Bluetooth Version: 4.2 – Wireless Range: Up to 30 ft. What’s In The Box: – Hook and loop fastener – Separated microphone Technical Specs: – Frequency Range: 87.5-108.0MHz – Digital Media File Compatibility: MP3 WMA WAV FLAC – Maximum USB/SD Memory Card Support Size: 64GB – Total Output: 5V/3.4A, 2.4A, and 1A&USB reading – FM Transmitter Size: 1.69’’ x 1.5’’ x 2.99’’ – inches – Microphone Size: 1.5’’ x 0.79’’ x 0.35’’ – inches – Length of Cable: 23.62’’ – inches