Scosche kickBACK Case for AT&T and Verizon iPhone 4 - Black Features - BlueTrack Technology - Microsoft BlueTrack Technology combines the power of optical with the precision of laser for remarkable tracking on virtually any surface. Comfort and durability - Rubber side grips and a contoured shape for either hand. Dust-resistant design allows you to track confidently. 5 Customizable Buttons - Reassign any button to fit your needs. Quick access to the media, programs, and files you use most often. Tilt Wheel - Easy horizontal and vertical scrolling.