Finished in premium lambskin leather and featuring a convenient swivel clip, this holster offers unparalleled comfort and elegance. Grooves run along the inside of the case to protect the trackball. Plus, it features a built-in proximity sensor, so it knows when your BlackBerry device is in place and automatically shuts off the screen in order to help maximize battery life. This technology also allows you to choose different notification settings for incoming calls, emails, and other functions based on whether your device is in or out of the holster.