Wireless Comfortable Pen Mouse in Silver... Pen Mouse is powered by 1200 dpi tracking technology and is switchable between 400 and 800 dpi. You can tilt it up to 85 degrees to provide a non-compromising surface advantage. Plus with 2.4GHz technology, Pen Mouse gives you an efficient performance with reliable working smoothness at all times. For power saving, a smart auto-detection is added to put Pen Mouse into sleep mode when no action has been detected, just press any button to start using it again. And the Flying scroll feature is the easiest way to fast web and document scrolling. Another advanced feature includes a plug-and-forget Pico receiver to prevent breakage when using a laptop or desktop. A travel case is included for protection.