The SeaLife RM-4K features brilliant 14mp still images and vivid 4K video in a incredibly small package that’s easy to hold and use alone or with attached lights like the SeaLife Sea Dragon. The ultra-compact removable inner camera and a robust external housing that mounts easily to a light tray. 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 the free ReefMaster app from Google Play Store or Apple App Store.
Have a look at our photo gallery and see the amazing images captured with the SeaLife ReefMaster RM-4K.
The easy to hold 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.
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. For optimal results, especially when shooting 4K video, use Micro SDXC Class UHS Class 3 (U3) or Video Class 30 (V30) memory cards.
Lighting is easy, use the ReefMaster RM-4K with Sea Dragon constant underwater LED photo/video lights (or other LED light sources). There’s no flash or cable to sync to an external strobe. Simply turn your light on and adjust the intensity based on the subject, conditions and distance.
The compact RM-4K is easily expandable with popular SeaLife accessories, including one or two Sea Dragon Photo/Video/Dive lights, and available 10x close-up or super macro lens. Its 2.0” TFT color LCD screen creates a sharp and easily visible display on the small camera.
For the latest app and technical updates, visit our technical updates and troubleshooting page.
14 megapixel Panasonic® CMOS image sensor for sharp colorful pictures
4K Ultra HD Video @ 30fps and 1080p HD video @ 60 fps
40m/130ft compact underwater housing with removable inner camera
140° Fisheye Lens – Get close to your subject and still fit everything into the picture
Underwater color-correction modes – Underwater Deep for diving and Underwater Shallow for snorkeling
Easy 4 button controls for easy operation
Wi-Fi – wirelessly preview, download and share pictures/videos to smart phone or tablet with “SeaLife ReefMaster” app (free download from Google Play Store or Apple App Store)
Image Stabilization – Electronic stabilization reduces vibration and hand movement for smoother video recording
Expandable memory using micro SDHC/SDXC memory card up to 128GB
Waterproof to 130ft / 40m
Compact design for easy handling and lightweight travel
Focus from 12” (30cm) to infinity (10X Close-up Lens or Super Macro Lens optional accessory)
Time lapse shooting at set time intervals – saves as video file or series of still images
Removable Li-ion rechargeable battery – 900 mAh / 3.8V / 3.42Wh for 2+ hours video or 500+ images
2.0” 230K Hi-res TFT color LCD
Expandable with popular SeaLife accessories (One or two Sea Dragon Photo-Video-Dive Lights, Close-up Lens, Super Macro Lens)
Free App Name: ReefMaster in App & Play stores
Focal Length: 2.5 mm (35 film equivalent = 14mm)
Focus type: Instant fixed-focus lens
Shutter response time: 0.30 seconds (AKA Shutter Lag)
Focus Range: 12 inches to Infinity (30cm to infinity)
Field of View*: 140° diagonal Fisheye Wide Angle Lens
Shutter speed: 1/25 to 1/2000 second
Shooting modes: Single, Burst (3, 7, 15 or 30 photos @ 1 photo/sec), Time Lapse Photo and Time Lapse Video
White Balance (WB): Auto, Underwater Shallow, Underwater Deep, Daylight, Cloudy, Tungsten, Fluorescent
ISO: Auto, 100, 200, 400, 800, 1600 and 3200
Exposure Compensation: Exposure from -2.0 to +2.0 in 0.3 increments
Delay Timer: Off, 2 sec and 10 sec
LCD: 2.0” TFT LCD color display 230K resolution (240 * RGB * 320)
Memory: Micro SDHC/SDXC memory card up to 128GB (Sold separately). Important: Use Video Speed Class V30 (U3).
Read/write speed: 10MB/s
PC: Windows XP / 7 and up
MAC: OS 10.8 and up
1x USB 2.0 out (for charging battery and downloading to computer)
1x Micro HDMI out (for direct connection to HDTV)
Battery: Removable Li-ion battery (900 mAh / 3.8V / 3.42Wh)
Still images: 2+ hours (Approx. 500+ images)
Video: 1.5 hours at 1080p and 1.2+ hours at 4K
WiFi range: 100ft (33m) on land.
Waterproof: Individually depth tested to 130’ (40 m)
Shockproof: 3ft / 1m
Buoyancy: Negative; -17 grams underwater
Land: 0°F to 120°F (-18°C to 50°C)
Underwater: +33°F to +110°F(.5 °C to 44°C)
Storage temp: -20°F to +140°F(-29°C to +60°C)
Tripod mount: Standard ¼-20 tripod threads
Weight: 7.1 ounces (202 grams) UW housing w/ inner camera and battery.
Dimensions (LxWxH): UW Housing: 1.9” x 4.1” x 2.6” (4.9cm x 10.5cm x 2.6cm)
Inner camera: 1.3” x 2.3” x 1.6” (3.3cm x 5.8cm x 4.1cm)
ReefMaster RM-4K inner camera
ReefMaster underwater camera housing
Battery for ReefMaster RM-4K camera
USB cable 30”/75cm (USB-A to micro-B)
Moisture Muncher 1-capsule sampler