With the Canon WP-DC11 waterproof case for the PowerShot G7, you can use your PowerShot G7 digital camera to take underwater shots at depths of up to 130' ( 40 m ). Of course it's also ideal for taking worry-free pictures in the rain, at the beach, or on the ski slopes. You can use your camera's internal flash for lighting purposes. Or, use the internal flash to trigger a slaved external strobe like those made by Fantasea, Sea & Sea, Ikelite, Sunpak or Sealife. The camera has a underwater white balance setting for available light photography.