The GoPro Standard Housing is a replacement casing for your GoPro HERO4, 3+, or 3. The casing has three different backs, also known as back doors. The standard back door makes the casing waterproof up to a 40-meter depth. If you easily want to reach the ports of your GoPro, you can use the skeleton back door with its open sides. Do note that this isn't waterproof. The touch back door allows you to use the touchscreen of the HERO4 Silver up to a 3-meter depth.