The Leather Swivel Holsters are outfitted with a swivel clip to adjust the holster for maximum wearing comfort. For some smartphones, they also include special indentations that snuggly protect your smartphone's trackball.A durable leather exterior protects the device, while its soft interior safeguards and cleans the screen. The magnetic proximity sensor tells your BlackBerry smartphone when you've put it away - so it can automatically switch off the screen and preserve your battery life.