LifeProof Headphone Jack Cover and Keeper Seal Cap - Spare Parts only for Apple iPhone 4 / 4S LifeProof Case - Black Waterproof and Dirt-Proof Seal The LifeProof Headphone Jack Cover & Keeper is vital for sealing you iPhone 4 / 4S Lifeproof Case Screws into your LifeProof headphone jack to completely seal your device. Replace your lost LifeProof Headphone Jack Cover & Keeper Waterproof and dirt-proof seal Compatible with the LifeProof iPhone 4 / 4S Case!