The revolutionary design of the Arc™ Mouse combines the comfort of a desktop mouse and the portability of a notebook mouse. Arc Mouse folds to 60% of its fully expanded size when you’re on the go. Two color options to match your personal style.
2.4 GHz - 30 ft. Wireless RangeThe 2.4 GHz wireless USB micro-transceiver connects wirelessly right out of the box with virtually no interference and has up to a 30 foot wireless range
Folds For PortabilityMouse folds to 60% of its fully expanded size using the strong metal hinge. Folding the mouse closed automatically turns it off.
Scroll WheelSave time and effort with the scroll wheel—navigate documents & Web pages without using the on-screen scroll bar.
Battery Status IndicatorYou won't get caught with a dead battery—the Battery Status LED Indicator glows red when the battery is running low.
Snap-in TransceiverMicro-Transceiver snaps into the bottom of the mouse.
One-touch access to Windows Flip 3D*Allows you to flip through open windows in a stack and quickly switch between applications for added productivity.
Customizable ButtonsGet quick access to the media, programs, and files you use most often with customizable buttons.
Comfort for Either HandUse your mouse with your left or right hand—ambidextrous design makes it comfortable either way.
Ergonomic DesignPoint and click in comfort—ergonomic design helps you work longer without discomfort.
Designed for Notebook PCsCompact and comfortable, our handy notebook and laptop products are designed for convenience and mobility.
Snap-in ReceiverPlug in the snap-in receiver when you’re ready to work, then snap it into your mouse when you travel, preserving battery life.
Laser TechnologyMicrosoft Laser Mouse products are more precise, more responsive, and deliver smoother tracking.
6+ Months Battery LifeWork with less interruption with longer battery life.
3-Year Limited Hardware Warranty
Product Price$59.95
And, this is the mouse looks like if we collapse it...
Source : www.microsoft.com
Comment : 
Mamoru-kun, an immobile and diminutive robot that could tell you where you last left those keys that you lose at an average of twice a day. Developed in cooperation with Fujitsu and Toyota, Mamoru-kun measures a mere 40cm tall and weighs 3.8kg. Mamoru-kun can find an object the owner is looking for within specified areas and alerts the owner about it either via verbally through speaker or by pointing at it using its jointed arm (it has another two joints at the neck). We're still very early on into the technology though - Mamoru-kun's lost-item-finding powers are limited to pre-programmed items in a specified area only.
