YUNZII has unveiled the C21, a tri-mode wireless mechanical numpad that combines a dedicated numeric keypad with a built-in calculator and a TFT display. Designed for users who need frequent access to numeric input, the C21 offers 2.4 GHz wireless, Bluetooth, and wired USB Type-C connectivity. It also features customizable RGB lighting, hot-swappable mechanical switches, and a 2,500 mAh battery. The numpad is listed at $54.99 on YUNZII’s official store, down from its original $69.99 price.
The YUNZII C21 uses an 18-key layout and measures approximately 98.3 × 152.56 × 38.9 mm, with a weight of around 250 grams. Its integrated 428 × 142-pixel TFT display adds a visual interface to the device, while its three operating modes cover keyboard input, calculator functions, and gaming. The combination is aimed at users who want more functionality than a conventional external number pad offers.
For customization, YUNZII equips the C21 with Candy Linear or Sage Linear mechanical switches. The numpad uses a gasket-mounted structure and dye-sublimated PBT MOA-profile keycaps. Its hot-swappable PCB supports compatible three-pin and five-pin mechanical switches, allowing users to change switches without soldering. Software customization is also supported on Windows and macOS through an online configuration tool.
Connectivity is another part of the C21’s design. Users can connect through Bluetooth, 2.4 GHz wireless, or USB Type-C, depending on their setup and preference. The built-in 2,500 mAh battery supports wireless operation, while the RGB backlighting and side lighting provide additional customization options. YUNZII offers the device in Pink, Beige, Purple, and Coffee color options.
The YUNZII C21 is designed for users who want a compact numeric keypad for office work, spreadsheets, calculations, and gaming. Its built-in calculator and TFT display distinguish it from standard mechanical numpads, while hot-swappable switches give keyboard enthusiasts more control over the typing experience.
YUNZII C21 Specifications
| Specification | Details |
|---|---|
| Product Name | YUNZII C21 |
| Product Type | Wireless Mechanical Numpad with Calculator |
| Layout | 18 keys |
| Display | TFT display |
| Display Resolution | 428 × 142 pixels |
| Connectivity | Bluetooth, 2.4 GHz wireless, USB Type-C |
| Operating Modes | Keyboard, Calculator, Gaming |
| Switch Options | YUNZII Candy Linear, YUNZII Sage Linear |
| Hot-Swappable | Yes, 3-pin and 5-pin switches |
| Mounting Structure | Gasket-mounted |
| Keycaps | Dye-sublimated PBT MOA profile |
| Backlighting | RGB backlighting and side lighting |
| Battery Capacity | 2,500 mAh |
| Dimensions | 98.3 × 152.56 × 38.9 mm |
| Weight | Approximately 250 g |
| Software Support | Windows and macOS |
| Color Options | Pink, Beige, Purple, Coffee |
| Original Price | $69.99 |
| Listed Price | $54.99 |
| Availability | YUNZII official online store |
