It has a nostalgic feel, much like a retro handheld console.
On April 20, 2026, zFrontier opened pre-orders for the “KB40,” a 40% keyboard kit designed by Niuniu.
The pre-order period runs from April 20 to May 18, 2026, with shipping estimated for Q4 2026 (September to December).
Pricing starts at $165.00.
While the 40% layout is a niche category that often divides opinion, the KB40 stands out not just for its small size, but for its versatile configuration allowing for multiple layouts and PCB choices.
There are 7 color options available, and the CERAKOTE model is particularly intriguing.
Let’s take a closer look at the details.
5 layouts in total: 2 Row-Staggered and 3 Ortholinear
The KB40 offers five different layout options: Staggered – 1, Staggered – 2, Ortho – 3, Ortho – 4, and Ortho – 5.
Note that these options refer to the switch plate type, not the PCB type.
- Row-Staggered: Staggered – 1, Staggered – 2
- Ortholinear: Ortho – 3, Ortho – 4, Ortho – 5
Here is a breakdown of the configurations:
- Staggered – 1 | 7u spacebar
- Staggered – 2 | 2.25u/2.75u spacebar
- Ortho – 3 | 7u spacebar
- Ortho – 4 | 3u spacebar
- Ortho – 5 | 1u × 7
Since you can choose between staggered and ortholinear, this kit offers a high degree of customization even within the 40% form factor.
While compact keyboards often get attention for their size and aesthetics, actual usability depends heavily on the chosen layout.
In that sense, the KB40 seems designed with careful consideration for 40% users, who often have very specific preferences.
Wired MX and Wireless MX/EC compatible versions available
Two PCB types are available: “Wired Only – MX hotswappable” and “Wireless – MX & EC compatible hotswappable.”
The wired version is an MX hot-swap PCB, while the wireless version supports both MX and EC (Electrostatic Capacitive) switches.
However, the product page does not specify the exact types or range of compatible EC switches.
2.4GHz connection requires a separate dongle
One thing to note regarding wireless connectivity is the 2.4GHz support mentioned in the product page Q&A.
While the KB40 wireless PCB supports a 2.4GHz connection, it requires the purchase of a separate dongle to use it.
This means choosing the wireless version doesn’t automatically give you a complete 2.4GHz setup out of the box.
If you’re interested in this feature, be sure to check the information in the “extras” section as well.
O-ring and gaskets included; foam sold separately
The package includes an aluminum top/bottom frame, weight/battery compartment, PCB + DB, plate, gasket tadpoles, O-ring, and rubber feet.
The plate is FR4 for the wired version and aluminum for the wireless version.
The wireless model also includes a lithium battery.
Interestingly, both gasket tadpoles and an O-ring are listed as included items.
On the other hand, the foam set is not included and is sold separately, so be sure to add it if you need it.
Summary: A noteworthy 40% kit for enthusiasts
That covers the main features of the KB40.
It’s quite rare to find a 40% layout—a category often associated with DIY builds—available as a custom keyboard kit like this.
This is exactly what we expect from Niuniu.
While the 40% layout isn’t for everyone, it’s a category that resonates deeply with those who love it.
The KB40 is more than just a new compact keyboard; it’s an exciting 40% kit that lets you experiment with different layouts and configurations.
summary
| (data) item | Contents |
|---|---|
| Product name | KB40 |
| Brand / Designer | Niuniu / Sold by zFrontier |
| Product Category | 40% Keyboard Kit |
| Price | $165 |
| Sales Method | Pre-order |
| Pre-order Period | April 20 – May 18, 2026 |
| Shipping Schedule | Q4 2026 |
| PCB | Wired MX Hot-swap / Wireless MX EC Compatible Hot-swap |
| layout | Staggered – 1 / Staggered – 2 / Ortho – 3 / Ortho – 4 / Ortho – 5 |
| plate (often as in “tectonic plate”) | FR4 (Wired) / Aluminum (Wireless) |
| included thing | Aluminum top/bottom frame, weight/battery compartment, PCB + DB, plate, gasket tadpoles, O-ring, rubber feet, etc. |
| 2.4GHz | Supported by wireless PCB; requires separate dongle for use |
| form | Sold separately |
- First published: April 20, 2026
- Last updated: April 20, 2026
- Source method: Referenced from official website
- Reference/Source: https://en.zfrontier.com/products/pre-order-kb40
- Conflicts of Interest: Product Offering: None Monetization Link in this paper: Yes
Greenkeys operates solely on performance-based advertising and does not use Google ads because they reduce usability.
Please support us through Buy Me a Coffee if you enjoyed reading the article so that we can continue to operate the media.
