Bluetooth USB adapter Bluetooth 5.1 receiver with 3.5mm audio cable USB Bluetooth Adapter 5.1: Our USB Bluetooth receiver integrates a 5.1 Bluetooth chip and features dual USB/AUX output modes. Even devices without USB functionality can use AUX mode for transmission, providing greater compatibility, stronger signal reception, and faster transmission without latency. Bluetooth Transceiver: The Bluetooth transceiver supports BT5.1, A2DP, and AVRCP Bluetooth versions, with a stable, latency-free transmission range of up to 10 meters. In transmitting mode, the adapter connects to the device and transmits the audio signal to the Bluetooth receiver. In receiving mode, the USB end of the adapter connects to a power source, while the other end transmits the audio information to headphones or a lautspree via a 3.5mm auxiliary audio cable. Built-in Microphone, Stereo: The built-in microphone of the Bluetooth USB adapter provides the most authentic and smooth sound for Bluetooth music playback and hands-free calling. When you're on a call on your phone, you can use the Bluetooth receiver's microphone to make calls hands-free, making your driving and office life more comfortable. Easy to use: The USB Bluetooth adapter automatically connects without the need for driver or software installation. Plug-and-play, Bluetooth pairing and connection are quick and easy. Pairing: The blue indicator light flashes; successful pairing: The blue indicator light remains on.