Compact wireless mouse allows for smooth, speedy navigating through large documents and web pages thanks to its forward/back thumb buttons and fast-scrolling, clickable wheel 2.4 GHz wireless connection (does not support Bluetooth) with a 33-foot range; uses AES-128 encryption for added security; this mouse uses a small USB receiver that can stay plugged into your computer without obstructing other ports Optical sensor works on most surfaces; ergonomic profile fits perfectly in the palm of the hand, ensuring comfortable use Compatible with Windows 7, 8, and 10; uses 1 AA battery (included); stylish Blue color Measures 4.3 by 3 by 1.6 inches; backed by an Amazon Basics 1-year limited warranty Fast-scrolling activation: Press the fast scrolling key in middle of mouse to easily activate the fast scrolling function