The Liquid Image Hydra Series is an Underwater Camera built into a dive mask, making underwater photography “Hands Free” for safer swimming, snorkeling, and scuba diving. The camera mask takes a 4GB+ micro SDHC card and can expand to a 32 GB card. A 4GB card records approximately 2 hours of video. Camera records approximately 700 or more images or 30 minutes of video per 1GB of memory added. It works well with the Model 347 – underwater 60 degree side torch.