2.4 Ghz Wireless mouse Noiseless mouse Silent mouse Mute Mouse USB Receiver for PC Laptop Mac Notebook(Blue) Mute button design,No "click" sound USB Nano Receiver Requires 1pc AAA battery to run. (Not included) USB receiver stows away inside the mouse when not in use; Wireless mouse with tiny USB receiver.Compatible with Windows 2000/NT/ME/XP/Vister/Win7/Win8. Quiet computer mice are ideal for those working in quiet environments.