The Logitech Fast RF Cordless Mouse Receiver Unit 831192-3000 C-BN4 is a wireless receiver designed for use with Logitech mice. Made in China, this receiver unit utilizes RF technology for smooth and reliable connectivity. Despite being worn, it still functions properly, allowing users to enjoy the convenience of a cordless mouse setup without any major interruptions. Ideal for those looking to extend the range of their wireless mouse or for replacement purposes, this Logitech receiver unit offers a simple and efficient solution for enhancing their computing experience.