The Logitech C-U0007 C-U0008 Unifying USB Receiver Dongle is a black USB receiver designed for use with various Logitech devices such as mice, trackballs, and touchpads. It allows for easy connectivity and is compatible with a range of Logitech products. The dongle comes with free shipping, making it a convenient and cost-effective option for those looking to expand their connectivity options. With its sleek black design and reliable USB connectivity, the Logitech C-U0007 C-U0008 Unifying USB Receiver Dongle is a practical and versatile accessory for any computer setup.