LifeProof Realtree Fre Case for iPhone 4/4S - Retail Packaging (Discontinued by Manufacturer) High degree of shock and impact protection-tested to Military Specifications MIL-STD-810F-516.5 (2 meters/6.6ft drop on all surfaces and edges. 26 tests) Ultra-slim and adds only 1/16 inch (1.5mm) when measured from the center of the phone Improves the bass and mid-frequency speaker response by utilizing the back of the case as a sub-woofer for a richer, fuller sound