TeckNet Classic Wireless Mouse M021: Enjoy all the reliability and accuracy of a corded mouse and the freedom and comfort of a wireless with the amazing TeckNet Classic M021. 6 Buttons Programmable: You are able to use various programmable functions, fully customizable buttons for unmatched performance! TruWave Precision: TeckNet Tru-Wave precision means you"ll enjoy smoother tracking on most surface. Co-Link For Anchored Pairing: TeckNet Co-Link Technology will automatically pair the Mouse with the Nano receiver-If the Nano connection is lost for any reason. TeckNet Advanced 2.4 GHz Wifi Connectivity: You get the reliability of a cord with cordless convenience and freedom-fast data transmission and virtually no delays or dropouts from up to 15M away. 18 Month-Long Battery: A Smart sleep mode and an On/Off switch act to save power, while an indicator light displays to inform when the mouse is active. LED logo light will sleep automatically after none use for 8 minutes to save battery. With 18 Months of battery life, you can almost forget about changing batteries. * Battery life may vary based on user and PC condition. Storable Receiver: If you need to remove the tiny receiver, there is a storage place next to the battery box. Tiny Wireless Receiver: It"s so small you can plug it into a USB port and forget about it. Back/Forward buttons: Moving quickly between documents or browsing your favorite Web sites is a breeze with large, easy-to-reach Back/Forward buttons. TeckNet 18 Months Warranty: Specifications: -Lifelong Clicks:5 Million -Battery Type:1 AA(NOT included) -Support:Windows 10,8,7,Vista Box Include: -1 X M021 Mouse -1 X Nano Receiver(Placed inside of the battery room) -1 X Manual * Battery is NOT included