The Sicura Hexa 400 is a vintage-inspired automatic dive watch with a 40 mm case, a second rotating bezel inside the crystal, and a manufacturer-rated water resistance of 400 metres. Its published specification sheet gives it a Sellita SW200-1 movement and an integrated steel bracelet; the main open questions for a buyer are how the 14 mm thickness and bracelet suit their wrist, and whether the movement’s 38-hour reserve fits their routine. This review separates documented specifications from performance and comfort claims that have not been established here.
What is the Sicura Hexa 400?
Sicura presents the HEXA400 as a current collection intended for underwater use and everyday wear. That is the brand’s positioning, not an independent finding about comfort or suitability. Independent coverage describes the Hexa 400 as a 2026 launch. The watch is vintage-inspired, though sources frame its historical connection differently: Dive into Watches relates it to the late-1960s PL/3L design, while Fratello says it draws inspiration from a 1968 Sicura 400 Diver. Sicura’s collection page, Dive into Watches’ hands-on report, and Fratello’s launch coverage provide the product and launch details.
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What do the dimensions mean on the wrist?
The published measurements are 40 mm across the case and 41 mm including the bezel, with a 46 mm lug-to-lug span and 14 mm thickness. The distinction between case and bezel width matters when comparing the Hexa 400 with watches advertised using only case width: the bezel is the widest point. Lug-to-lug length is useful for estimating how far the watch may span across the top of a wrist, while thickness affects how it sits beneath a cuff. These dimensions alone cannot establish fit; wrist shape, bracelet sizing and personal preference matter.
Dive into Watches reports a weight of 196 g with an unshortened bracelet. That is not a sized-wrist weight, and shortening the bracelet changes the figure. The available coverage does not establish how comfortable the bracelet feels or how easy its adjustment is in practice.
#1 Best Overall
- Read Before You Buy — No Video Output: These adapters support charging and USB 2.0 data transfer, but cannot transmit video signals. Except for standard USB webcams (which use USB data only), they are not compatible with HDMI/DisplayPort cables, video-capable USB-C hubs, or docking stations with video output.
- Convert USB-A Ports to USB-C: Designed to connect USB-C earphones, cables, flash drives, card readers, and other USB-C accessories to standard USB-A ports. Plug-and-play with no drivers or software required.
- Aluminum Alloy Housing: Built with a sturdy aluminum alloy shell that aids in heat dissipation and protects against daily wear and scratches. Designed to maintain a stable and secure connection.
- Compact & Travel-Friendly: The ultra-compact design allows the adapter to stay plugged into your device without blocking adjacent ports or adding bulk, reducing wear and tear on your original USB ports.
- 12-Month Warranty: Backed by a 12-month manufacturer warranty for peace of mind. Designed to meet strict quality control standards for reliable everyday performance.
How does the dual-bezel arrangement work?
The Hexa 400 pairs a conventional external unidirectional bezel with an internal 12-hour rotating scale. The outside bezel has a ceramic insert and 120 clicks; the upper screw-down crown turns the inner scale. The lower crown handles the movement and time-setting functions. Coverage says the internal scale can be used to display a second time zone, while the external elapsed-time bezel serves the familiar dive-watch timing role.
The two bezels offer distinct functions, but their real-world usability depends on operation and readability. The published specifications describe the controls; they do not establish how easily either bezel can be used underwater or with gloves.
Rank #2
- 5-in-1 USB-C Hub: Experience comprehensive connectivity featuring a Power Delivery input, two USB-A 2.0 ports, a USB-A 3.0 port, and an HDMI port. (Note: The USB-C power delivery input port is only for connecting an external wall charger to power your laptop and cannot power peripheral devices.)
- 90W Pass-Through Charging: Achieve optimal charging with 90W pass-through power to your laptop, supported by a total input of 100W, with the hub reserving 10W for operational efficiency. (Note: Wall charger not included.)
- Quick Data Transfers: Accelerate your productivity with rapid data transfers using a high-speed 5Gbps USB 3.0 port and two 480Mbps USB 2.0 ports.
- 4K HDMI Display: Enhance your visual experience with a hub capable of delivering 4K resolution at 30Hz in both mirror and extend modes. Please note that this hub is compatible with MacBook (macOS 12 and newer), Windows 10 and 11, ChromeOS, and laptops equipped with DP Alt Mode and Power Delivery. Note: This device is not compatible with Linux.
- What You Get: Anker USB-C Hub (5-in-1, 4K HDMI), welcome guide, 18-month warranty, and our friendly customer service.
What are the published specifications?
| Specification | Published information |
|---|---|
| Case | 316L stainless steel; 40 mm case width, 41 mm including bezel; 14 mm thick; 46 mm lug-to-lug (Dive into Watches and Fratello) |
| Water resistance | 400 metres / 40 ATM, as reported by independent coverage; this is a stated rating, not a pressure test performed for this review (Dive into Watches and Fratello) |
| Crystal | Flat sapphire with anti-reflective treatment (Dive into Watches and Fratello) |
| Crowns and caseback | Screw-down crowns and screw-down caseback; upper crown operates the inner bezel, lower crown controls the movement (Dive into Watches and Fratello) |
| External bezel | Unidirectional, 120-click, ceramic insert (Dive into Watches and Fratello) |
| Internal bezel | Rotating 12-hour scale operated by the upper crown (Dive into Watches and Fratello) |
| Movement | Sellita SW200-1 automatic (Dive into Watches and Fratello) |
| Power reserve | 38 hours, reported by Dive into Watches |
| Additional movement details | Manual winding, hacking seconds, 28,800 vibrations per hour (4 Hz), and 26 jewels (Fratello) |
| Bracelet | Integrated stainless-steel bracelet; coverage reports a folding clasp and extension. Fratello specifies a dive extension and tool-free micro-adjustment. |
| Weight | 196 g with an unshortened bracelet (Dive into Watches); sized weight not stated |
The published movement details describe the caliber, not the accuracy of an individual watch. The sources cited here do not provide controlled timing results, lume-duration measurements, prolonged-wear observations, or a diving test. The 400-metre rating should therefore be understood as the reported specification rather than evidence of testing by this reviewer.
Which dial color and reference should you choose?
| Dial and accents | Reported reference | What to check |
|---|---|---|
| Black dial with yellow accents | H400.SS.A.40ATM.01.SS (Dive into Watches) | Confirm the current dial details, local stock and price with the seller. |
| Blue dial with yellow accents | H400.SS.A.40ATM.02.SS (Dive into Watches) | This is the pictured reference in Dive into Watches’ report; confirm current availability. |
| Orange dial with white accents | H400.SS.A.40ATM.03.SS (Dive into Watches) | Confirm the current dial details, local stock and price with the seller. |
Fratello also lists black, blue and orange versions. Color is the clearest documented difference among the variants; the sources do not establish a technical distinction between them. Choose based on the dial you prefer, then verify the exact reference and what is actually available in your market.
Rank #3
- Sleek 7-in-1 USB-C Hub: Features an HDMI port, two USB-A 3.0 ports, and a USB-C data port, each providing 5Gbps transfer speeds. It also includes a USB-C PD input port for charging up to 100W and dual SD and TF card slots, all in a compact design.
- Flawless 4K@60Hz Video with HDMI: Delivers exceptional clarity and smoothness with its 4K@60Hz HDMI port, making it ideal for high-definition presentations and entertainment. (Note: Only the HDMI port supports video projection; the USB-C port is for data transfer only.)
- Double Up on Efficiency: The two USB-A 3.0 ports and a USB-C port support a fast 5Gbps data rate, significantly boosting your transfer speeds and improving productivity.
- Fast and Reliable 85W Charging: Offers high-capacity, speedy charging for laptops up to 85W, so you spend less time tethered to an outlet and more time being productive.
- What You Get: Anker USB-C Hub (7-in-1), welcome guide, 18-month warranty, and our friendly customer service.
How much does the Sicura Hexa 400 cost?
The official homepage and Fratello’s launch coverage list a price of €1,450; Dive into Watches reports CHF 1,450. These are market-specific published prices, not a guaranteed current price in every country. Check Sicura or an authorized local seller for current pricing, taxes, stock and the exact reference before buying. The cited coverage does not provide enough like-for-like competitor data to establish whether the Hexa 400 is better value than another dive watch.
Quick Recap
Best Value
- 5-in-1 Connectivity: Equipped with a 4K HDMI port, a 5 Gbps USB-C data port, two 5 Gbps USB-A ports, and a USB C 100W PD-IN port. Note: The USB C 100W PD-IN port supports only charging and does not support data transfer devices such as headphones or speakers.
- Powerful Pass-Through Charging: Supports up to 85W pass-through charging so you can power up your laptop while you use the hub. Note: Pass-through charging requires a charger (not included). Note: To achieve full power for iPad, we recommend using a 45W wall charger.
- Transfer Files in Seconds: Move files to and from your laptop at speeds of up to 5 Gbps via the USB-C and USB-A data ports. Note: The USB C 5Gbps Data port does not support video output.
- HD Display: Connect to the HDMI port to stream or mirror content to an external monitor in resolutions of up to 4K@30Hz. Note: The USB-C ports do not support video output.
- What You Get: Anker 332 USB-C Hub (5-in-1), welcome guide, our worry-free 18-month warranty, and friendly customer service.
Rank #4
- Dual Converters, Infinite Potential：Includes 2× USB C male to USB A female adapters and 2× USB A male to USB C female adapters. Perfect for a wide range of uses—tablets with Bluetooth keyboards, expand USB ports on macbook, and more. Two different converters for all your daily needs
- Next-Level 10Gbps & 3A Charging: No more slow 480Mbps, this usb to usb c adapter has a transfer speed of up to 10Gbps, allowing you to do more transferring in less time. This usb adapter fits both USB A and USB C charger, supporting up to 3A fast charging
- Upgraded Exquisite Craftsmanship: With an aluminum alloy housing and metal connector, the usbc to usb adapter is extremely durable and sturdy. Rigorously tested to withstand more than 10,000 times of plugging and unplugging, ensuring long-lasting performance
- Broad Compatible: The usb c to usb adapter widely supports all USB C/ USB A devices like laptops, tablets, cellphones, car chargers, and phone chargers. Such as compatible with MacBook Pro/Air 2023/2022, Thunderbolt 4/3 Devices,Apple MagSafe Watch 9/8/7/SE/Ultra, iPad Pro 2022/2021, Samsung Galaxy S23/S20/S10, and iPhone 17/16/15 Pro. Plug and play
- Please Note: To reach 10Gbps speed, keep the cable under 3.3 ft. For USB A Male to USB C adapters, try flipping the USB C connector. USB C Male to USB A adapters support bidirectional 10Gbps transfer within 3.3 ft
What should a buyer verify before purchasing?
- Fit: Compare the 41 mm maximum bezel width, 46 mm lug-to-lug length and 14 mm thickness with a watch you already know fits. Try it on if possible; the listed dimensions cannot predict comfort.
- Bracelet sizing: Ask how links are removed and how the clasp extension and micro-adjustment work on the specific version. The cited coverage reports these features but does not document their ease of use.
- Water use: Confirm the seller’s guidance for crown operation and water-resistance servicing. A stated 400-metre rating does not mean an individual watch has been pressure-tested for this review.
- Ownership support: Check the warranty, service route, and local availability of parts with the seller. The sources cited here do not establish those terms.
- Price and reference: Match the dial, full reference number and local price on the actual listing; launch-era euro and Swiss-franc prices are not universal current quotes.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
