Kensington 72229 PocketMouse Convertible Dual-Size Mouse DiamondEye optical technology responds to your fastest movements with accurate tracking on virtually any surface Ultra-compact mouse with go-anywhere size has AirForm shell that clips on for the comfort of a full-size mouse Interference-free Quick RF wireless technology prevents cursor hesitation to provide ultra-smooth movement and precise control Backed by a one-year manufacturer's warranty Like having two mice in one, with 2 programmable buttons to streamline tasks and a scroll wheel to speed through long documents