The Techkey BT503 USB Adapter is a Bluetooth 5.0 wireless audio receiver designed for use with PCs. It features black color and comes with a 1-year manufacturer warranty. This unit is a single Bluetooth adapter manufactured in China by Techkey. With Bluetooth connectivity and support for Bluetooth v5.0 standard, this USB adapter allows for seamless wireless connectivity to enhance audio quality and simplify connections for a variety of devices. Ideal for improving your home networking and connectivity experience.