4 in 1 Bluetooth 5.0 audio transmitter and receiver has transmitter mode, receiver mode, AUX output mode, and USB output mode. First, this HiFi wireless adapter can transmit audio from non-Bluetooth TV, home stereo system, or CD player to a Bluetooth headset, speaker, and receiver wirelessly with transmitter mode. Second, this Bluetooth 5.0 EDR adapter can transmit audio from a Bluetooth-enabled phone, tablet, or computer to wired stereo, speakers, or headphones wirelessly with receiver mode. Third, this Bluetooth 5.0 audio transmitter and receiver have AUX output, it can play music on mobile phones or tablets easily on cars without Bluetooth. Finally, this Bluetooth 5.0 audio transmitter and receiver has a USB output, it can play music on a mobile phone or tablet computer easily on cars without Bluetooth. All in all, this HiFi wireless audio adapter can easily switch between transmitter and receiver modes with a button. It can plug and play without a driver required, you deserve it. 4-in-1: Transmitter and receiver mode, AUX, and USB output mode Transmitter Mode: Transfer audio from TV, stereo system to Bluetooth headset/speaker Receiver Mode: Transfer audio from phone, tablet to speakers or headphones AUX Mode: A car without Bluetooth can easily play music on the phone or tablet USB Mode: Read the USB interface through the car, easily play music on the phone or tablet Portable USB Bluetooth transmitter for TV Low latency wireless audio adapter for 3.5mm stereo Bluetooth 5.0 receiver compatible with Bluetooth headphones and speakers Supports multiple modes: transmitter, receiver, AUX output, and USB output Transmitter Mode: Wirelessly transfers audio from non-Bluetooth devices like TVs and stereo systems to Bluetooth headsets or speakers