Original Logitech Unifying Receiver 1 to 6 Devices USB Wireless Keyboard Mouse Item Features/Specifications Brand New / New Original / High Quality It??s convenient, reliable connection 2.4 GHz wireless technology. It lets you connect up to six compatible mice and keyboards to one receiver. Download Unifying software to quickly add all of your devices to one receiver. Brand: Logitech Important: This unifying receiver is only compatible with Logitech mouse and keyboard that have a unifying logo. When you receive the new receiver, You must pair the new receiver to your mouse/keyboard. Please make sure that you have the unifying software downloaded. NOT compatible to 3.0 USP Port. Compatible Model Anywhere Mouse MX (M905) Performance Mouse MX(M950) Wireless Mouse M505,M510,M525,M305,M310,M315,M325,M345,M705 Couch Mouse M515 Touch Mouse M600 Marathon Mouse M705 Logitech keyboard K230,K250,K270,K320,K340,K350 Logitech Wireless Solar Keyboard K750,K800 Logitech Wireless Desktop MK710,MK605 Logitech Wireless Wave Combo MK550 Wireless Combo MK520 , K520 Logitech Number Pad N305 Logitech Wireless Trackball M570