Travellor iPad 2/3/4 Case Silicone Kid Proof Rainproof Sandproof Dust-Proof Shockproof Extreme Duty Dual Protective Back Cover with Kickstand and Sticker for iPad 4/3/2 (Blue Purple) Sealed ports block blown sand and dust (up to 18 msec for 6 hour). Rigid internal frame protects against shocks and drops (Test: drop on flat concrete surface from 6'/1.13m). Integral Display shield deflects wind and rain (Test:upto 200mm/hr for 6hour). Independently tested and certified to meet conditions outlined in US Department of Defense MIL-STD-810 and UK Department of Defense Def-Stan 00-40. Silicone cladding blocks vibration (18hrs at 20to 2005Hz).Includes multi-position workstan.