If you are looking for housing online, check the product specifications to verify if the housing is actually compatible with your camera. Also, keep in mind there are some universal camera housings. But, generally, such models tend to have fewer camera-specific features. Then comes the part of the actual functionalities of the housing. You should be able to access the camera controls and the lens zoom and focus system after placing the camera inside the housing. Finally, the housing should be of good quality. You don’t want to take chances with an expensive camera.