▁To ▁use ▁the ▁jack ▁and ▁still ▁maintain ▁the ▁water proof ▁function , ▁Life Proof ▁provides ▁a ▁short ▁water proof ▁ear phone ▁extension ▁wire ▁that ▁sc rew s ▁into ▁the ▁jack ▁on ▁the ▁case . ▁When ▁used ▁with ▁water proof ▁ear ph ones , ▁this ▁allows ▁a ▁sw immer ▁to ▁listen ▁to ▁music ▁while ▁fully ▁under water , ▁provided ▁that ▁the ▁sw immer ▁remains ▁near ▁the ▁surface . ▁For ▁deeper ▁subm ersion ▁or ▁vig orous ▁sur f ing , ▁a ▁d ive ▁case ▁with ▁a ▁higher ▁rating ▁is ▁useful . ▁Optional ▁" Life jack et ▁Float " ▁fl ot ation ▁jack eting ▁can ▁be ▁added ▁to ▁some ▁models ▁to ▁prevent ▁the ▁equipment ▁from ▁s inking ▁if ▁dropped ▁into ▁water . ▁ ▁Life Proof ▁claims ▁that ▁it ▁water ▁tests ▁every ▁case ▁before ▁sh ipping . ▁Following ▁the ▁first ▁test , ▁Life Proof ▁will ▁send ▁the ▁case ▁to ▁an ▁independent ▁agent ▁to ▁perform ▁additional ▁tests . ▁ ▁If ▁the ▁case ▁passes ▁both ▁tests , ▁the ▁case ▁will ▁be ▁sh ipped , ▁and ▁if ▁the ▁case ▁does ▁not ▁pass , ▁it ▁will ▁be ▁scra pped . ▁Every ▁Life Proof ▁case ▁meets ▁a ▁military ▁standard ▁as ▁well . ▁The ▁M IL ▁ST D ▁ 8 1 0 G - 5 1 6 . 6 ▁is ▁the ▁United ▁States ▁Military ▁Standard ▁that ▁de als ▁with ▁the ▁functional ▁drop ▁of ▁an ▁electronic ▁device . ▁The ▁standard ▁requires ▁that ▁the ▁tested ▁item ▁can ▁phys ically ▁and ▁function ally ▁with stand ▁the ▁frequent , ▁repet itive ▁shock s ▁encountered ▁in ▁transport ation