1、Allows the computer to have Bluetooth function, realize wireless transmission and sharing. 2、Support for WINDOWS ALL/OS X/LINUX system, support for iphone earbuds of 3rd generation. 3、Achieve higher sensitivity, faster transmission speed, and more stable device connection. 4、Small, lightweight and portable, convenient for carry and storage, high performance. 5、After the device is successfully matched for the first time, it will automatically connect after the subsequent startup. 1 x USB Bluetooth Adapter1 x Manual Item Type: USB Bluetooth AdapterMaterial: ABSColor: As Picture ShownWeight: Approx. 12.0g/ 0.4ozBluetooth Version: Bluetooth  5.0Bluetooth Chip: for BR8041Transmission Distance: About 10mScope of Application: Support for WINDOWS ALL/OS X/LINUX system, support for iphone  earbuds of 3rd generation.Function: Computer Bluetooth ExpansionHow to use: 1. Confirm whether the transmitter you purchased is the call version 2. Insert the transmitter into the USB port of the computer, the red and blue lights flash alternately 3. Turn on the pairing status of the Bluetooth headset/speaker 4. Wait for the transmitter to automatically pair with the Bluetooth headset and speakers (the computer does not require any operation) 5. After the pairing is completed, the red light of the transmitter is always on 6. Some computers need to set the sound output channel, or plug it in again