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SeaLife SportDiver Underwater Housing for iPhone®

SeaLife  |  SKU: SL400-U
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Product Information

The SeaLife SportDiver Underwater Smartphone Housing (SL400-U) is a Bluetooth-connected underwater case that lets divers and snorkelers shoot photos and video on their own smartphone down to 130 feet (40 meters). It fits iPhone 11 through iPhone 16 Pro Max, iPhone 17 and 18 Pro, and Samsung Galaxy S20 and up along with many other Android phones, and it runs on two AAA batteries for more than 50 hours of continuous use.

Who it is for

The SportDiver is built for divers and snorkelers who want to use the camera they already know, their own smartphone, instead of buying a separate dedicated underwater camera. It suits travelers who want to pack light, since the housing weighs 22.6 oz (641g) and offers near-neutral buoyancy, and it suits anyone who wants manual camera control underwater through large shutter and control buttons sized for dive gloves.

Key details

  • Depth rating: 130 feet (40 meters)
  • Construction: polycarbonate, stainless steel, aluminum, and optical grade glass
  • Weight: 22.6 oz (641g), housing only
  • Power: two AAA batteries (alkaline or NiMH), 50+ hours of continuous use
  • Wireless: Bluetooth Low Energy 5.0 pairing with the free SportDiver app
  • Buoyancy: positive 2.8 oz (80g) with batteries and filter installed
  • Dual leak alarm: internal moisture sensor plus vacuum pressure alarm with on-screen, audio, and LED warnings
  • Three 1/4-20 tripod mounts for attaching a light or light tray, such as SeaLife's Sea Dragon lights

Compatibility and sizing

The housing accepts phones up to 6.49" x 3.15" x 0.38" internally, covering iPhone 11 through iPhone 16 Pro Max and the iPhone 17 and 18 Pro. The iPhone 17 and 18 Pro Max do not fit this housing and require the larger SeaLife SportDiver Ultra instead. On the Android side, Samsung Galaxy S20 and up and many other Android phones are supported. The free SportDiver app is available on the App Store and Play Store and supports the current and previous OS generation.

What's in the box

  • SportDiver Underwater Smartphone Housing
  • Red color-correction filter
  • Vacuum pump
  • Rubber grip tabs (12x small, 12x medium, 12x large)
  • Spare O-rings (1x main O-ring, 1x vacuum check port O-ring)
  • O-ring lubricant
  • O-ring removal tool
  • Deluxe wrist strap with clip
  • Moisture Muncher sample pack (1 capsule)
  • AAA alkaline batteries (2)
  • EVA carry case

DiveCatalog.com is an authorized SeaLife dealer and a dive shop in Irvine, California since 2003. Call or chat with us if you need help confirming fit with your specific phone model or compatibility with your other dive gear.

⚠️ WARNING: This product contains chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, visit www.P65Warnings.ca.gov.

Frequently Asked Questions

How do I check an underwater housing's seal before a dive?

Before every dive, open the housing somewhere clean and dry, inspect and wipe the main o-ring and its groove, and close it with nothing trapped in the seal, because a single hair or grain of sand is enough to flood it. Confirm every latch is fully closed and that any vacuum or leak alarm reads correctly. Where you can, soak the sealed housing in a rinse tank or hang at the surface before descending, so a leak shows up before depth.

How do I care for housing o-rings?

Remove the main o-ring regularly with a plastic tool rather than anything metal, which can nick the groove, and clean both the o-ring and the groove with a lint-free cloth. Apply a thin film of the silicone grease the manufacturer specifies, since grease helps the o-ring seat and slide rather than sealing by itself, and a thick coat only collects grit. Replace o-rings on the schedule in the manual, or sooner if they look flattened, cut, or dry.

What do moisture alarms and desiccant packs do?

A moisture alarm is a sensor inside the housing that beeps or flashes when it detects water, giving you a chance to abort the dive before the camera is ruined. Desiccant packs absorb humidity in the air sealed inside the housing, which prevents the port fogging as you descend into cooler water. Neither replaces a proper seal check, since they provide early warning and fog control rather than leak prevention.

How deep can I take an underwater camera housing?

Only as deep as its rated depth, which the manufacturer sets and publishes in the specifications, and it should never be exceeded even briefly. Depth ratings assume a housing in good condition with intact seals, so worn o-rings or a damaged port reduce the real margin. If your diving might take you deeper, choose a housing rated comfortably beyond your planned maximum depth.

Can I use a phone housing for scuba diving?

Only if the housing is specifically rated for the depth you plan to dive, because many phone cases are splash- or snorkel-rated rather than scuba-rated. Touchscreens generally do not respond underwater, so a diving phone housing needs mechanical buttons or another control method. A phone's own water-resistance rating is not a substitute for a housing, and any housing still needs seal checks and o-ring care.

How do I rinse a camera housing after diving?

Soak the closed, sealed housing in fresh water and work every button and dial while it is submerged so salt does not dry inside the control shafts. Let it dry completely, especially around latches and seams, before you open it, since opening a wet housing drips water straight onto the camera. Avoid opening a housing on a wet, moving boat deck whenever you have the option to wait.

What should I do if my housing floods?

Get the housing out of the water and open it somewhere dry, then immediately remove the camera's battery and memory card, because leaving a battery in a wet camera does more damage than the water itself. Do not power the camera on to check whether it still works. Dry everything gently away from direct heat, get salt-water-exposed equipment to a repair technician promptly, and inspect the housing to find which seal failed before you dive it again.

Which phones are compatible with the SeaLife SportDiver housing?

The SportDiver fits iPhone 11 through iPhone 16 Pro Max, plus iPhone 17 and 18 Pro, as well as Samsung Galaxy S20 and up and many other Android phones. The internal cavity accepts phones up to 6.49" x 3.15" x 0.38". The iPhone 17 and 18 Pro Max are too large and require the separate SeaLife SportDiver Ultra housing instead.

What batteries does the SeaLife SportDiver use and how long do they last?

The SportDiver runs on two AAA batteries, either alkaline or NiMH, which provide more than 50 hours of continuous use. Two AAA alkaline batteries are included in the box, so the housing is ready to use right away without needing to source batteries separately.

Is the SeaLife SportDiver housing buoyant underwater?

Yes, the SportDiver has a positive buoyancy of 2.8 oz (80g) with batteries and filter installed. Actual buoyancy varies by smartphone model.

What is included with the SeaLife SportDiver housing?

The box includes the housing, a red color-correction filter, a vacuum pump, rubber grip tabs in three sizes, spare main and vacuum check port O-rings, O-ring lubricant and a removal tool, a deluxe wrist strap, a Moisture Muncher sample capsule, two AAA alkaline batteries, and an EVA carry case.