【BLUETOOTH USB DONGLE INCLUDED】This Bluetooth headset comes with a USB dongle in the package, you can use our Bluetooth headset on a computers without Bluetooth function, just plug the USB dongle into your PC, turn on the Bluetooth headset, they will pair automatically. Perfect for call centers, offices, remote work, online classes, Skype, Zoom, Google Meetings, and more. 【CRYSTAL CLEAR AUDIO】This wireless headset with directional microphone provides clear sound when having a phone conversation, providing a quiet call environment for the user. Enjoy the freedom of wireless mobile calls and music while driving, running and working. 【UNIVERSAL COMPATIBLE】The Sarevile Bluetooth headset adapts the latest Bluetooth 5.2 technology. This Bluetooth headset with microphone supports two device connections. On ear wireless headphone is compatible with cell phones, tablets, computers, telephones and other Bluetooth devices. How to pair 2 devices at the same time: Step 1: Press and hold the power button for 6-7 seconds to power on, you can see the indicator light flashing red and blue alternately. At this time, turn on the Bluetooth on your first device, find "KH-23" and click to connect. The indicator will turn blue when connected. Step2: After connected to the first device, turn off the Bluetooth of your first device, and then the Bluetooth headset will enters the pairing status automatically. Turn on the Bluetooth on your second device, search "KH-23" and click to connect. Step3: After connected with second device, turn on the Bluetooth on you first device, search "KH-23" and click to connect. Now the Bluetooth headset is connecting with 2 devices.