Feker JJK21 Mechanical Keyboard

The Feker JJK21 Numpad is a compact, programmable 21-key numpad kit with a rotary knob, suited for users who want customizable input and media control in a small form factor. It appeals to hobbyists who prefer hot-swappable switches and need flexible connectivity options including wired and wireless modes. This numpad fits well for office or creative workflows that benefit from dedicated numeric input and quick media adjustments.

Key Features

• Programmable via dedicated software, allowing custom key mapping and RGB lighting effects.
• Rotary knob provides convenient media control or other assignable functions.
• Hot-swappable PCB supports most 3-pin and 5-pin mechanical switches, enabling easy switch changes without soldering.
• RGB backlighting offers multiple color and effect options for visual customization.
• Supports Bluetooth 5.0, 2.4GHz wireless, and wired USB-C connections, giving versatile use cases across devices.

Build and Typing Experience

• Gasket-mounted design with a PC mounting plate delivers a softer, more cushioned typing feel by isolating the plate from the case.
• Includes silicon foam inserts to reduce typing noise and dampen hollow sounds from the case.
• Plate-mounted stabilizers help maintain key stability for larger keys, improving typing consistency.

Compatibility and Software

• Compatible with Windows XP through Windows 10 for software programming and connectivity.
• Full key anti-ghosting ensures all simultaneous key presses register correctly.
• Software allows customization of lighting and key functions, enhancing workflow personalization.

Trade-offs

• Limited to a 21-key layout, which may not suit users needing a full keyboard or extensive macro layers.
• Battery capacity is 1500mAh, but actual wireless usage time is unknown.
• Software support is Windows-only, limiting customization for other operating systems.