Trident Case B-CY-THDB-EXBAT AEGIS Series for HTC Thunderbolt Electra Extended Battery and Case - Black - 1 Pack - Retail Packaging The Electra Series protective case and extended-life battery for HTC Thunderbolt Constructed from high impact-resistant polycarbonate and double-enforced with a shock absorbing silicone outer-ring. Scratch-resistant, built-in PET screen protector shields screen from fingerprints, smudges, scratches and moisture while maintaining complete touch screen interactivity. Dust protectors over microphone and speaker bays keep out dust and debris while the audio and power jacks are fully protected under silicone plugs when not in use. HTC Thunderbolt