Note: MK220, Mk240, MK260, Mk270 keyboard and mouse sets are distinguished between the new version and the old version. The receiver is different. Our receiver only use for The label number SN14/15/16 starts with the new versionFeature:For Logitech original Nano receiver can be connected to keyboard and mouse at the same time, there is no difference between the two use, Logitech driver recognizes normally.Suitable for Logitech MK220, MK235, MK240, MK260, MK270, MK275, MK345 and other wireless keyboard and mouse sets and supporting mouse models such as M150, M210, M212, M185, M170; M238, M220 and other single miceHow to use the USB receiverWhen you receive the new receiver, you must pair the new receiver to your mouse.Attention:The product comes with logo, hope you don't mind. Thanks!Package list:1 x USB Receiver