Trident Case AG-LUMIA520-BLU Aegis Series Case for Nokia Lumia 520 - Retail Packaging - Blue Meets Military Standard MIL-STD-810F: vibration and drop (Independently Tested). Inner-layer of shock-absorbing silicone with an outer-layer of hardened polycarbonate, providing two layers of protection. Self-applicable screen protector included. Power-ports and audio-jacks are covered with silicone plugs to keep out dirt and debris. Dust filters protect microphone and speaker bays. Lanyard loop allows you to accessorize your phone with key chains, charms or other accessories. Compatible with: Nokia Lumia 520