V-Lock, iPhone 4 Waterproof Hard-cases
By V-lock is water-proof and super protective hard-cases which specifically designed for the iPhone 4. This iPhone 4 hard-cases claimed to be able to protect iPhone 4 from water, dust, sand, etc.
The v-unlock hard-cases has two sides cover –front and back to protect iPhone 4 from water and dust, a standard internal mechanism to prevent the any unwanted object touches the iPhone itself.
There are three places of metal screws on the back cover, you can use a coins and rotate it 90 degrees to open or lock the v-lock hard-cases.
The lower part of v-unlock has become the hinge.
You cannot use buttons, slots, but home button and the screen (touch panel) only. However, the touchscreen is working great without a problem.
The sound quality is terrible when the musics or ringtones are playing.
A sound quality during active calls is not really good.
iPodTouchLab did a test to take the iPhone 4 protected by v-lock hardcases to the shower, but no single drop of water inside the iPhone.
You can buy v-lock hardcases through Amazon Japan. This hardcases cost Ôø• 2,480 (2,480 Japanese Yen) = roughly US $30. You can check the real-time USD to JPY conversion rate through XE.com
Hardcases 
