The mechanical keyboard market is crowded with increasingly similar-looking 75% keyboards, but the KiiBOOM Phantom81 V4 takes a different approach. Rather than relying solely on a traditional aluminum chassis, it uses a frosted acrylic case designed to work alongside its RGB lighting, creating a translucent aesthetic that gives the keyboard a distinctive presence on a gaming or productivity desk.
There is more to the Phantom81 V4 than its appearance, though. Underneath the semi-transparent exterior is an 81-key, 75% layout, gasket-mounted construction, hot-swappable PCB, rotary knob, tri-mode connectivity, and an 8000mAh battery. It also supports a 1000Hz polling rate over wired and 2.4GHz wireless connections, putting it firmly in the category of keyboards designed for both gaming and everyday use.
At around £148.78, the Phantom81 V4 is not an inexpensive mechanical keyboard. However, KiiBOOM has equipped it with enough features to make the price easier to justify, particularly for users looking for a keyboard that combines customization, wireless flexibility, and a more distinctive design.
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Design and Build Quality
The biggest selling point of the KiiBOOM Phantom81 V4 is immediately obvious. Its frosted acrylic chassis gives the keyboard a semi-translucent appearance that allows its internal lighting to become part of the overall design.
Unlike a conventional opaque keyboard, the case interacts directly with the RGB lighting. The result is a softer, more diffused glow that complements the semi-transparent PC keycaps. The frosted finish also helps hide internal components while reducing the appearance of fingerprints compared with a completely clear acrylic construction.
The aesthetic is undoubtedly subjective, but it gives the Phantom81 V4 considerably more character than many conventional gaming keyboards.
KiiBOOM has also included a stainless-steel weight base, which contributes to the keyboard's approximately 1.5kg weight. That is substantial for a 75% keyboard, but it helps keep the Phantom81 V4 firmly planted during use.
The combination of acrylic and metal creates an interesting balance. The acrylic provides the visual identity, while the weight underneath gives the keyboard the stability expected from a premium mechanical keyboard.
The keyboard measures 325 x 147.6 x 48.6mm, making it compact enough for most desks while still retaining the functionality of a larger layout.
An Excellent 75% Layout
The Phantom81 V4 uses an 81-key, 75% layout, which is one of the more practical compromises for both gaming and productivity.
It removes the dedicated number pad, substantially reducing the keyboard's footprint, while retaining the arrow keys, function row, and navigation keys that can be inconvenient to lose on smaller 60% or 65% keyboards.
For gamers, this leaves plenty of room for a mouse without requiring users to sacrifice the function row. For productivity, it maintains many of the keys needed for shortcuts and navigation.
KiiBOOM also claims that the layout saves around 30% of desk space compared with a full-size keyboard. While the exact amount will vary depending on the keyboards being compared, the general benefit is clear: the Phantom81 V4 provides considerably more room for a mouse without feeling excessively compromised.
The metal rotary knob in the top-right corner is another welcome addition. It can be configured through the KiiBOOM driver, including its clockwise, counter-clockwise, and press actions.
That makes it useful for more than simply adjusting volume. Depending on how it is configured, it can become a convenient control for media, applications, lighting, or other functions.
Gasket Mount and Typing Experience
A premium mechanical keyboard is ultimately judged by how it feels and sounds, and this is another area where the Phantom81 V4 is well equipped.
The keyboard uses a gasket-mounted structure alongside multiple layers of sound-dampening material. KiiBOOM lists sandwich foam, switch pads, a PE sound-dampening pad, bottom foam, and bottom silicone among the internal materials.
The intention is to create a softer typing experience while reducing unwanted resonance from the case.
This construction is particularly well suited to the keyboard's pre-lubed linear switches, which are designed to provide a smooth keystroke without the tactile bump of a tactile switch or the audible click associated with a clicky switch.
KiiBOOM describes the resulting sound profile as creamy and thocky. Those descriptions have become common in the mechanical keyboard community, but the underlying design choices make sense for achieving a deeper and more muted sound profile.
The gasket mounting also gives the board some additional flexibility compared with a rigid mounting system. That can make longer typing sessions more comfortable, although the exact feel will naturally depend on individual preferences and typing style.
The stabilizers are pre-lubed plate-mounted units, while the PC plate contributes to the keyboard's overall softer character.
KiiBOOM Crystal Switches
The Phantom81 V4 is supplied with KiiBOOM Crystal Switches, although the Crystal Switch variant is currently listed as sold out or unavailable in the supplied product information.
The switches have a total travel of 3.6mm, with a pre-travel of 1.6mm and an actuation force listed at 55 ± 15gf. Bottom-out force is listed at 60 ± 15gf.
The switches use a nylon stem and PC housing.
On paper, these specifications put the Crystal Switches in a fairly approachable range for users who prefer linear switches that are not excessively light or heavy. The pre-lubing should also contribute to a smoother out-of-the-box experience.
One of the Phantom81 V4's biggest advantages, however, is that users are not locked into these switches.
Hot-Swappable Switches
The hot-swappable PCB makes the Phantom81 V4 considerably more flexible than a traditional soldered mechanical keyboard.
Users can remove the supplied switches and install alternatives without soldering. This makes the keyboard suitable for newcomers who want to experiment with mechanical switches, while also giving enthusiasts the option to fine-tune the board over time.
Someone who prefers tactile switches can replace the linear switches, while users who want an even smoother or quieter experience can experiment with other options.
This also adds longevity to the keyboard. If a switch eventually develops a fault, it can be replaced individually rather than requiring the entire keyboard to be repaired or replaced.
RGB Lighting That Actually Works With the Design
RGB lighting is common on gaming keyboards, but the Phantom81 V4's frosted acrylic construction gives it a more important role than usual.
The keyboard features south-facing RGB LEDs with support for 16.8 million colors. The semi-transparent PC keycaps and frosted case help diffuse the lighting, producing a softer overall glow rather than simply illuminating the legends.
The lighting can be customized through the KiiBOOM driver, including brightness, speed, patterns, and different effects.
The dual-zone approach also gives users more control over how the keyboard looks. Gamers can create more obvious lighting profiles, while users who want a less distracting setup can opt for more restrained lighting.
It is one of the areas where the Phantom81 V4's design and functionality work particularly well together.
Tri-Mode Connectivity
Wireless connectivity is another major strength.
The Phantom81 V4 supports 2.4GHz wireless, Bluetooth 5.0, and USB-C wired connectivity, allowing it to adapt to different setups.
The 2.4GHz connection is the most interesting option for gaming. KiiBOOM lists a 1000Hz polling rate for both wired and 2.4GHz connections, putting it on par with the polling rates expected from modern gaming peripherals.
Bluetooth drops to 125Hz but is better suited to general productivity and multi-device use.
The keyboard can also pair with up to three Bluetooth devices, making it possible to move between multiple systems without constantly reconnecting the keyboard.
The physical connectivity switch makes changing modes straightforward, while USB-C provides the wired option when users want maximum consistency or need to charge the keyboard.
8000mAh Battery
The Phantom81 V4's 8000mAh battery is one of its standout specifications.
KiiBOOM claims approximately 84 hours of continuous use with RGB enabled, increasing to around 180 hours with RGB disabled.
Actual battery life will naturally depend on factors such as lighting brightness, connection mode, polling rate, and usage patterns, but even with RGB enabled, the claimed endurance is substantial.
For someone who uses the Phantom81 V4 primarily as a wireless productivity keyboard, disabling RGB could mean going for a considerable period without needing to charge it.
The large battery also makes the keyboard particularly suitable for users who regularly move between a home office, gaming setup, and other locations.
Gaming Performance
The Phantom81 V4 is not positioned purely as an enthusiast typing keyboard. Its 1000Hz polling rate over 2.4GHz and wired connections gives it the specifications needed for gaming.
The N-Key Rollover (NKRO) support is also useful. It allows multiple keys to be registered simultaneously, reducing the possibility of missed inputs when several commands are being pressed together.
For competitive games, the 1000Hz polling rate is the more relevant feature. It does not automatically make a player better, but it provides the responsiveness expected from modern gaming peripherals.
The 75% layout is also a strong choice for gaming because it gives the mouse more room to move without eliminating the function row or arrow keys.
The linear Crystal Switches should be particularly well suited to fast-paced games where smooth and consistent key presses are desirable.
Software and Customization
The Phantom81 V4 is compatible with KiiBOOM's driver software, which provides access to the keyboard's customization options.
Users can remap keys, create macros, configure lighting, and adjust the rotary knob. The knob can be assigned separate actions for clockwise rotation, counter-clockwise rotation, and pressing it.
There is one limitation worth noting: the physical Fn key itself cannot be reassigned. However, KiiBOOM allows users to customize the functions associated with Fn combinations.
This should be enough for most users, although those looking for completely unrestricted key-level customization may want to consider keyboards with broader QMK/VIA implementations.
The supplied information also indicates support for QMK/VIA downloads, which will be appealing to keyboard enthusiasts who want greater control over their layouts.
Mac and Windows Support
The Phantom81 V4 supports both Windows and Mac, with a physical switch used to change operating-system modes.
This is a useful feature for users who regularly move between platforms. Rather than relying entirely on software profiles, the keyboard provides a straightforward hardware-level way of changing its operating mode.
That makes it particularly practical for mixed-device setups.
What Could Be Better?
Despite its extensive feature set, the Phantom81 V4 is not without compromises.
The first is price. At around £148.78, this is firmly positioned above many entry-level and mid-range mechanical keyboards. There are cheaper 75% keyboards available with hot-swappable PCBs and wireless connectivity.
The Phantom81 V4 therefore has to justify its price through the combination of build quality, aesthetics, battery capacity, sound profile, and additional features rather than any single specification.
The acrylic design will also not appeal to everyone. Some users will prefer the understated appearance of an aluminum keyboard, particularly for professional environments where RGB lighting and translucent components may feel excessive.
The approximately 1.5kg weight is another consideration. It contributes to stability, but this is not an especially lightweight keyboard for users who frequently travel with their peripherals.
Finally, buyers should be aware that shipping from China can involve additional import taxes or customs fees, depending on the destination. The supplied product information explicitly states that these costs are not included in the listed price.
Verdict
The KiiBOOM Phantom81 V4 is a strong mechanical keyboard for users who want something that stands out without sacrificing the features expected from a modern gaming and productivity board.
Its frosted acrylic case is the headline feature, but the keyboard's appeal goes considerably deeper. The 75% layout, gasket-mounted construction, hot-swappable PCB, rotary knob, tri-mode connectivity, 1000Hz polling rate, NKRO, and 8000mAh battery give it a specification sheet that can compete with considerably more conventional premium keyboards.
The RGB implementation is particularly effective because the translucent chassis is designed around it, while the gasket mount and multiple layers of dampening should appeal to users who care about typing feel and acoustics.
At around £148.78, it is difficult to call the Phantom81 V4 a budget option. Buyers are paying for a combination of design and functionality rather than simply the ability to type or play games. That makes it less compelling for anyone looking for the cheapest route into mechanical keyboards.
For users who want a premium 75% wireless mechanical keyboard with a distinctive acrylic design, however, the Phantom81 V4 makes a convincing case for itself. It combines enthusiast-friendly customization with the convenience of wireless connectivity and a large battery, while still offering the responsiveness needed for gaming.
The result is a keyboard that looks considerably different from the average gaming peripheral, but does not rely on its appearance alone to justify its place on the desk.
KiiBOOM Phantom81 V4 — Key Specifications
Final verdict: The KiiBOOM Phantom81 V4 is an impressive premium 75% mechanical keyboard that combines a distinctive frosted acrylic design with strong gaming performance, extensive customization, and excellent wireless battery life. Its price and unconventional aesthetic may limit its audience, but for users who value both looks and functionality, it is an easy keyboard to recommend.
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