Microsoft Arc Touch Mouse - Storm Gray (RVF-00020) Flexible Design - Curve for comfort, flatten to pack. Touch to Scroll - Click. Tap. Flick. Control. BlueTrack Technology - Works on difficult surfacesrough, glossy, or soft. Perfectly Portable Stowable Nano Transceiver for wireless freedom. BlueTrack Technology - Works on difficult surfaces-rough, glossy, or soft. Flexible Design - Curve for comfort, flatten to pack. Touch to Scroll - Click. Tap. Flick. Control. BlueTrack Technology - Works on difficult surfacesrough, glossy, or soft. Perfectly PortableStowable Nano Transceiver for wireless freedom.