RAPOO | M7100P-R 5G Ergonomic Wireless Optical Mouse - RED (Nano Receiver) Innovative reliable 5.8GHz wireless technology, prevent interference from other device 500 / 1000 CPI switchable High-definition tracking engine 4D Scroll wheel, scroll up / down, scroll side to side, and also as a button, page up/down side buttons for convenient web surfing. Advanced programmable-buttons allow to define shortcut to Applications, Office file and Web pages. A list of keys or combined keys (eg. Ctrl-X) can be set to MACROs. Complicated operation is done by one touch. Power Saving Technology, battery life up to 18 MONTHS, can operate with a single battery. Low-voltage alarm alerts.