The unique ergonomic housing was especially designed for use underwater, while the housing is easy to hold and use even with one hand, the tough enclosure also features a unique closing system – a “Pressure Lock” thumb screw that exerts the optimal amount of pressure on the housings O-ring seal. The waterproof housing encases the small inner camera, and also stores a powerful drying agent called “Moisture Muncher” next to the camera that prevents internal fogging caused by heat and humidity trapped inside the housing. Featuring a compact removable inner camera and a robust external housing that mounts easily to a light tray or can just as easily be hand-held due to its contoured ergonomic body. The easy, 4-button control system makes catching the action an effortless process. The ReefMaster offers WiFi sharing ability, so you can wirelessly preview, download and share pictures & videos to a smart phone or tablet with a free app from Google Play Store or Apple App Store. With the expandable memory of the ReefMaster RM-4K, you can use Micro SDHC memory cards up to 128GB, ensuring you have room to shoot & save all of your video content. It also has a time lapse function - shooting at set time intervals and saves as video file or series of still images. The compact RM-4K is easily expandable with popular SeaLife accessories, including and not limited to one or two Sea Dragon Photo/Video/Dive lights, and the super macro lens. Its 2. 0” TFT color LCD screen creates a sharp and easily visible display on the small camera. The ReefMaster RM-4K includes the ReefMaster 4K inner camera, ReefMaster underwater camera housing, wrist strap, 30”/75cm USB cable and camera pouch. 14 Megapixel Panasonic®  CMOS sensor 4K Ultra HD / 30 fps  1080P Full HD / 60 fps 140° Fisheye lens 2. 0" TFT color LCD display 2 Digital colour correction filters 40m Depth rating Easy to operate with 4 buttons Recharcheable batterypack Focus from 30cm to infinity Timelaps WiFi  Micro HDMI 1/4 2" Tripod mount Micro SD card (max. 128GB).