With the Canon WP-DC22 waterproof case you can use your Canon PowerShot SD1100 digital camera to take underwater photos at depths of up to 130' (40 m). Of course it is 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 or Sealife.