Most notably, the Pearl uses a translucent trackball (the "Pearl"), which facilitates horizontal and vertical scrolling, instead of the traditional BlackBerry scroll wheel. The backlit color of the 8100 trackball is controlled by a series of LEDs and may be changed by software loaded on the phone; the 8110, 8120 and 8130 models trackball is lit only in white. The color customization capabilities also extend to the notification LED in the top right corner of the device. This LED can be programmed to blink different colors depending on which contact has called, texted or emailed.