{A MOUSE THAT PROTECTS YOUR PRIVACY} 2.4G Wireless Optical Mouse 5 Buttons1600 DPI w/ Nano Receiver For Windows 10, 8.1, 8, 7, Vista, XP (Black) A MOUSE THAT PROTECTS YOUR PRIVACY LOCK KEY: Side Button To Lock Your Screen DESKTOP KEY: Top Button To Show Desktop NANO-RECIVER: Stays in your PC USB port or stows conveniently inside the wireless mouse when not in use POWER SAVE FUNCTION: To turn off the Mouse automatically when you do not operate it for 5 minutes to save the battery power.