Note: MK220, MK240, MK260, and MK270 keyboard and mouse sets are available in both new and old versions. The receiver differs between versions. Our receiver is compatible only with the new version, identified by a serial number (SN) starting with 14, 15, or 16.Feature: This Logitech original Nano receiver allows simultaneous connection of a keyboard and mouse. There is no functional difference between the two devices when connected. The receiver is recognized normally by Logitech drivers.Compatible with Logitech MK220, MK235, MK240, MK260, MK270, MK275, MK345 wireless keyboard and mouse combos, as well as individual mouse models including M150, M210, M212, M185, M170, M238, and M220.How to use the USB receiver: When you receive the new receiver, you must pair it with your mouse before use.Attention: The product includes branding. We appreciate your understanding.Package list: 1 x USB Receiver