The ergonomic right handed design provides hours of comfort and with four colors to choose from itrsquos easy on the eyes too the pro fitreg mid size wireless mouse is built to deliver years of service backed by a limited lifetime warranty perfect for desktop and mobile users alike the pro fitreg mid size wireless mouse has a nano receiver that operates 24 ghz to reduce interference in crowded office environments the receiver is so small you can leave it in your computer or slide i