Griffin Survivor + Belt Clip for iPod touch 4G (Pink, Black) Independently tested and certified to meet conditions outlined in US Department of Defense MIL-STD-810 and UK Department of Defense Def-Stan 00-35 . Integral Display shield deflects Wind/Rain (up to 200 mm/hr) . Rigid internal frame protects from Shock/Drop (concrete from 6'/1.8 m) . Sealed ports block Blown Sand/Dust (up to 18 m/sec) . Silicone cladding blocks vibration (18 hrs at 20-2000 Hz) .