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1Clear out junk files and repair common Windows errors2Scan for outdated or missing drivers - takes under a minute3Repair Windows errors before they cause bigger problemsChoose the PRG-340-1 if you want a compass display that is easier to read at a glance, a rotating bezel to remember a direction, or a lighter listed weight. Choose the PRG-270-1 if you prefer its conventional display or value its longer published operating estimate without light after charging. Their core sensor functions and listed measurement ranges are closely matched, so the decision is mainly about display, fit, materials and power-use estimates—not a major sensor upgrade.
How the PRG-270-1 and PRG-340-1 differ
| Feature | PRG-270-1 | PRG-340-1 | What it means for you |
|---|---|---|---|
| Display | Conventional display; Casio’s cited product page does not describe a duplex LCD. | Duplex LCD: compass graphics appear on an upper layer, with time or measurements on a lower layer. | The PRG-340-1 gives compass information a more dedicated visual presentation. |
| Orientation features | No rotating bezel or movable-lug feature is described on the cited product page. | Rotating bezel for simple orientation memory; movable lugs let the case and band lie flat. | The PRG-340-1 offers practical layout conveniences, not a substitute for map-and-compass skills. |
| Listed dimensions | 54.6 × 52.4 × 15 mm | 54.7 × 51.7 × 15.1 mm | Dimensions are close; both are large watches by their longest measurement. |
| Listed weight | 67 g | 54 g | The PRG-340-1 is 13 g lighter in Casio’s specifications. |
| Case and band materials | Resin case and resin band. | Bio-based resin case and soft urethane band; Casio describes bio-based materials in most parts. | These material descriptions do not establish a comparative lifecycle impact. |
| Approximate operating period after full charge | About 9 months under normal use without further light exposure. | About 7 months under normal use without further light exposure. | Casio’s estimate is longer for the PRG-270-1 under this condition. |
| Water and cold ratings | 100 m water resistance; operation specified to −10°C. | 100 m water resistance; operation specified to −10°C. | The listed ratings are the same. |
Specifications and operating estimates above are from Casio’s product information; they are not independent test results. Operating periods are approximate and depend on the stated conditions.
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Which model has the better compass display?
PRG-340-1: a layered compass presentation
The PRG-340-1 uses a duplex LCD. Casio describes compass graphics on the upper layer and time or measurements on the lower layer, so compass information can remain visually distinct from the other readouts. Its rotating bezel can help you keep track of a direction you have identified.
PRG-270-1: a more conventional layout
The PRG-270-1 provides a digital compass, but the cited product information does not describe the PRG-340-1’s duplex display or rotating bezel. If you do not need those presentation and orientation features, the PRG-270-1 still provides the same broad compass capability.
#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.
Are their outdoor sensors and functions different?
Both watches have Casio’s Triple Sensor functions: an altimeter, barometer, digital compass and thermometer. Casio lists the same measurement ranges for both models:
- Altimeter: −700 to 10,000 m; up to 30 manual altitude records.
- Barometer: 260 to 1,100 hPa.
- Digital compass: 0–359° measurement with a 16-point display.
- Thermometer: −10 to 60°C.
Both also include a sunrise/sunset display, stopwatch, countdown timer and daily alarms. Casio lists five daily alarms for the PRG-270-1; the cited specifications identify the same broad alarm function for the PRG-340-1. The available specifications do not establish a major sensor-function advantage for either watch.
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.
Which is more comfortable to wear?
Casio lists the PRG-340-1 at 54 g and the PRG-270-1 at 67 g. The PRG-340-1’s 13 g lower listed weight may matter on long days or if you are sensitive to a heavy watch, although weight alone cannot determine comfort. Their listed case dimensions are very close, and both measure more than 54 mm along their longest dimension. Neither is a compact choice for someone seeking a small watch.
Quick wins for a faster PC:
Repair Windows errors before they cause bigger problemsFix Now →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →The PRG-340-1’s movable lugs let its case and band lie flat, which may be useful for storage or packing. That design feature does not change its listed case dimensions.
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.
What do the solar operating estimates mean?
Casio estimates approximately 9 months of operation for the PRG-270-1 and 7 months for the PRG-340-1 under normal use without exposure to light after charging. These are manufacturer estimates, not results from an independent test, and they describe a specific no-light condition rather than a guaranteed interval between charges in everyday use.
For a different condition—darkness with power saving enabled—Casio lists 24 months for the PRG-270-1 and 27 months for the PRG-340-1. These are also condition-dependent manufacturer estimates. The difference between the estimates means the preferred model depends on the usage condition you are considering; it does not establish that one watch always lasts longer.
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
How do their materials and prices compare?
Casio lists a resin case and band for the PRG-270-1. For the PRG-340-1, it lists a bio-based resin case and band, with soft urethane band material and bio-based materials used in most parts. The descriptions identify the listed materials but do not, on their own, support a broader environmental ranking.
The Tool Desk
Outbyte PC Repair FREERepair Windows errors before they cause bigger problemsFix Now →Outbyte Driver Updater FREEFix the driver behind crashes, sound loss and screen glitchesFind Drivers →Casio’s Netherlands comparison listing showed €199 for the PRG-270-1 and €249 for the PRG-340-1. Those are regional listed prices, not a worldwide price comparison or a guarantee of current availability. Check a local listing for the exact model suffix and current price before buying.
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.
Which one should you choose?
Choose the PRG-340-1 if
- You want the duplex LCD’s distinct compass presentation.
- You expect to use the rotating bezel to keep a direction in mind.
- You prefer the lower listed weight or the movable-lug design.
- You want the listed bio-based resin construction, while recognizing that the material description is not a lifecycle comparison.
Choose the PRG-270-1 if
- You prefer a conventional display and do not need the PRG-340-1’s bezel or duplex layout.
- The approximately 9-month normal-use estimate without light after charging better fits the condition you care about.
- You find it at a better local price for the exact suffix and availability you want.
Both are solar-powered, rated to 100 m water resistance and specified for operation down to −10°C. If their common outdoor functions meet your needs, decide between them by how you want to read the compass, how much listed weight matters, and which model suits your priorities on power estimates and price.
Quick Recap
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.
