About this product: 【Four-in-One Functionality: Transmits Music from Mobile Phones to Home Speakers, Supports Voice Assistants】 This Bluetooth 5.3 transmitter and receiver functions as ① a transmitter, ② a receiver, ③ a TF card transmission mode (inserting a TF card into the receiver to send music to home speakers, wired earphones, etc.), and ④ a computer card reader (also functions as an external sound card for your computer). It's a 4-in-1 Bluetooth transmitter. It supports scenarios where music from smartphones is sent to home speakers or car speakers, or where audio from CD players, MP3 players, computers, and other audio devices is sent to headphones or speakers. 【LCD Display, Automatic Bluetooth Connection, No Incorrect Connections】 You can adjust the volume by long-pressing the volume buttons. The built-in LCD display clearly shows the Bluetooth connection name, Bluetooth connection mode, battery level, playback/pause status, and other operating modes at a glance. 【Direct USB Connection for Bluetooth and 8-Hour Battery Life】 In addition to the standard Bluetooth receiver and transmitter modes, when selecting computer transmission, you can also directly insert the Bluetooth transmitter into the USB interface of the computer. 【Turns Car Audio into Bluetooth】 Insert it into the car's AUX interface and connect to your mobile phone's Bluetooth to support hands-free calls, navigation broadcasts, and music playback. 【Intelligent Memory, Automatic Link Back】 The built-in smart chip automatically restores the device to its state before power off. No need to reconnect to Bluetooth. Turns a regular TV into Bluetooth. 【Wide Compatibility, One-Touch Easy Operation】 Compatible with any system, connecting various devices with a 3.5mm jack, such as cars, TVs, earphones, smartphones, PCs, iPhones, Android devices, computers, Nintendo Switch, and audio equipment, as Bluetooth devices. You can easily switch between Bluetooth receiver (receiving mode) and Bluetooth transmitter (transmitting mode) by pressing the mode button, allowing for various uses.