Seidio BD2-HK3HTMECX-BK DILEX Extended Case and Holster Combo for use with Seidio Innocell Batteries for HTC Thunderbolt - Black Interior casing made from highly durable and impact absorbing polymer; Exterior skeleton provides extra protection at impact points such as corners and sides Exterior skeleton provides extra protection at impact points such as corners and sides Easy to put in and pull out of your pocket or purse and finger grooves for easy gripping The power and volume buttons are covered but remain functional while all other ports and controls are open and accessible For use with: HTC ThunderBolt