There are two ways to control a phone inside an underwater housing. Either the housing has its own buttons on the outside of the shell, or the phone's own touchscreen stays usable through a flexible membrane. Both keep the phone dry. They differ in what you can reach underwater, what you carry, how long it takes to get comfortable and which accessories you end up buying.
In brief: buttons win on feel, especially in thick gloves, and touchscreens win on reach, because the whole phone stays usable. Weight depends more on the specific housing and its accessories than on the control type. Button housings vary a lot, so we describe what is typical of the category and name no other brands. For the touchscreen side we use our own SeaTouch 6 Pro, where we can give confirmed figures. For a feature checklist against the previous generation, see SeaTouch 4 Max vs. button and Bluetooth housings.
How Each Type Works
Button housings put a set of buttons on a sealed shell. Depending on the design, a button either acts on the phone mechanically through a sealed shaft, or sends a command over Bluetooth to a companion app that turns it into a camera action. In most designs the front is a rigid window, so you can see the screen but not operate it by touch: it serves as the viewfinder, and settings are reached through the buttons or the app.
Touchscreen housings replace the rigid front with a flexible film. On the SeaTouch 6 Pro, finger pressure passes through DIVEVOLK's sixth-generation membrane to the phone's capacitive screen, so you operate the phone exactly as you do on land. The body is button-free, with three layers of seals and rated waterproof to 60 m (IPX8).
That design has one consequence every SeaTouch buyer should understand. Once a phone is sealed inside a SeaTouch, its volume, power and side buttons cannot be pressed. The touchscreen is the only way in. Some phones have a native underwater mode that switches the touchscreen off and moves the shutter to the volume keys; inside a button-free housing that leaves you with no control at all, so those modes stay off.
The two designs also differ in how many places the shell is opened up. Every mechanical button is a shaft passing through the housing wall with its own seal, and pressure climbs by roughly one atmosphere for every 10 meters of seawater, as NOAA's National Ocean Service notes. A buttonless body has fewer of those penetrations to maintain, though every housing, of either type, still needs its pre-dive check.
Controls
The clearest difference is how much of the phone you can reach underwater.
| Task | Typical button housing | Touchscreen housing (SeaTouch 6 Pro) |
|---|---|---|
| Take a photo or start video | Dedicated button you can find by feel | On-screen shutter; optional Bluetooth external shutter for a tactile trigger |
| Switch between phone cameras | Depends on how the buttons are mapped | Tap the lens selector in the native camera app |
| Set focus point and exposure | Often left to auto, or reached through a button sequence | Tap to focus, drag to adjust exposure |
| Use other apps | Limited to what the companion app or buttons support | Any app on the phone, such as Lightroom, Linne Lens or DoubleTake |
| Review footage | Varies by design | Full playback through the touchscreen |
| Thick gloves | Buttons work through most gloves | Bare finger or touchscreen finger sleeves; external shutter for the trigger |
| Maps and calls at the surface | Limited to the functions the buttons or app expose | Usable through the housing at the surface |
Buttons have real strengths. You can find a good one by feel without looking down, it responds the same way through a thick glove, and a wet hand brushing against it does not count as a tap. Human-factors guidance points the same way. The FAA's advisory circular on flight-deck controls notes that a smooth touchscreen gives little tactile sense of position and can demand more visual attention. It was written for cockpits rather than dive gear, but the observation applies.
The touchscreen's strength is breadth. Everything the phone does on land is available at depth, from manual focus to a fish-ID app, and nothing has to be remapped. Our guide to apps worth trying with the SeaTouch 6 Pro shows how far that goes.
The SeaTouch 6 Pro closes much of the tactile gap with an accessory instead of building buttons into the shell. DIVEVOLK's Underwater External Shutter is a Bluetooth 5.4 trigger rated to 60 meters and tested to more than 100,000 presses. The 6 Pro gives it two mounting positions, so it falls under your thumb in either a left- or right-hand grip. It pairs through the phone's own Bluetooth settings with no companion app, as our external shutter introduction shows. For cold water, DIVEVOLK's touchscreen finger sleeves let a gloved hand use the membrane.
Weight
The SeaTouch 6 Pro weighs 485 g on land and about 150 g in the water with an iPhone 16 Pro Max installed, which DIVEVOLK describes as close to neutral. Its predecessor, the SeaTouch 4 Max Plus, was 435 g on land and 155 g in the water. That pair of numbers shows why one figure is never enough: the newer housing is 50 g heavier in your bag and 5 g lighter in your hand underwater.
When you compare any two housings, ask for both numbers with the same phone installed. A dry weight tells you about travel. The in-water weight tells you how the rig will trim and how tired your wrist gets on a long dive. Accessories change both, often by more than the housing itself.
Control type affects what you carry, though not always the scale. A mechanical button housing carries a shaft and seal behind each button. A Bluetooth button housing carries electronics and a battery in the shell, which means one more thing to charge or replace before a dive. The SeaTouch 6 Pro shell has no electronics; its only powered part is the optional external shutter. Neither type is automatically lighter, so treat a published weight as a starting point and ask how it was measured. For keeping the whole rig light on a trip, see our minimalist SeaTouch 6 Pro travel kit.
Learning Curve
We are not aware of a controlled study comparing how quickly divers learn the two types, and we have not run one. What can be said is where the learning sits in each.
With a button housing, you learn a mapping: which button does what, and how that changes between photo, video and settings modes. A diver who only needs start and stop can be comfortable quickly. A diver who wants to change exposure or switch cameras underwater has more to memorize, and designs that rely on a companion app add a pairing and setup step before every dive.
With a touchscreen housing, you already know the interface, because it is your phone's own camera app. What is new is touching the screen through a film, judging small on-screen targets in moving water, and the setup habits that keep the touchscreen working: leaving native underwater modes off and silencing calls before you seal the phone. The SeaTouch 6 Pro also removes one old annoyance. Its larger touch window restores the native swipe-up gesture on big phones, which the previous generation could only replace with AssistiveTouch.
Both types demand attention, so learn a new housing before your first open-water dive with it. Practice in a pool or on a shore dive, and keep the camera behind your gas, depth and buddy checks. Divers Alert Network has documented how a photographer distracted while diving can miss exactly those checks. For what the switch is like in practice, read one diver's account of moving from buttons to full touch. If you want to understand why the wrong input happens on either type, we break the failure modes down in why familiar touchscreen controls matter.
Accessories
With a button housing, the controls are part of the shell, so you do not need an accessory to get a tactile shutter. What you can add beyond that depends on each brand's own mounting system and, for Bluetooth designs, on whether the companion app supports your phone and operating system version.
The SeaTouch 6 Pro keeps the base housing simple and builds out from a modular mount:
- In the box: a snorkeling red filter tuned for 0 to 10 meters that clips straight onto the lens window, and desiccant pads for the built-in anti-fog slot.
- Expansion Clamp with 67 mm lens adapter: M6, 1/4-inch, cold-shoe and M8 interfaces, with a six-section adjustable arm that centers a wet lens over any phone's camera position. Two M8 holes take a second arm, so a wide-angle and a macro lens can ride together.
- Internal Red Filter: clips inside the wide-angle lens barrel and covers 5 to 25 meters.
- Second-generation Dome Lens: fits the integrated dome port slot with no adapter for split shots.
- Underwater External Shutter: the tactile trigger described above.
- Other parts: a horizontal and vertical quick-switch mount, macro screen magnifier, protective cover, travel case and back glass tempered film.
There is no companion app to keep updated, because the housing runs whatever is on the phone. Phone changes matter too. The SeaTouch 6 Pro takes phones up to 180.0 × 82.5 × 11.2 mm and no more than 17 mm thick at the camera module, which covers every iPhone through the iPhone 18 Pro Max and thick-module Android flagships, so the housing and its accessories can carry over when you change phones. Our SeaTouch 6 Pro kit buying guide sorts these accessories by diving style.
Which Type Fits You
A button housing may suit you if you only need to start and stop recording, you dive cold water in thick gloves most of the time, and you want controls you can find without looking.
A touchscreen housing suits you if you want the full camera app at depth, use other apps underwater or between dives, want to review footage as you go, or want to check your position or call for help from the surface without opening the housing.
The middle ground is a touchscreen housing with a Bluetooth external shutter: the whole phone for settings and apps, plus one physical trigger you can find by feel.
Whichever way you lean, confirm that your exact phone fits before you buy. Technical support can check a model against the current compatibility list, and the full specifications are on the SeaTouch 6 Pro underwater housing page.
