BlackBerry Leather Swivel Holster for BlackBerry Pearl White 8300, 8310, 8320, 8330 Built-in grooves constructed of hard plastic run along the front and back insides of the case to protect the trackball Convenient swivel clip; Rotates vertically, horizontally and to various degrees in between for maximum comfort Proximity-sensing technology; Saves power and maximizes battery life by automatically shutting off the screen Proximity-sensing technology; Can activate different notification settings for phone, email and other applications based on in-holster and out-of-holster profiles Lambskin leather exterior