Introduction
Thank you for choosing the MMD KM21Pro Mechanical Numeric Keypad. This manual provides detailed instructions for setting up, operating, and maintaining your new keypad. Please read this manual thoroughly to ensure optimal performance and longevity of your device.
Figure 1: MMD KM21Pro Mechanical Numeric Keypad (Green)
Package Contents
Ensure all items are present in your package:
- 1 x MMD-KM21Pro Numeric Keyboard
- 1 x USB-A to USB-C Data Cable
- 1 x Product Instruction Manual
Setup
The MMD KM21Pro offers versatile connectivity options. No drivers are required for basic functionality.
Connectivity Modes
The keypad supports three connection modes:
- Bluetooth: For wireless connection to compatible devices.
- Wireless 2.4G: Using the included USB dongle for a stable wireless connection.
- USB (Wired): Connect directly via the USB-C cable. This mode also charges the keypad.
Figure 2: Dual USB 2.0 HUB ports on the MMD KM21Pro. No driver required.
The keypad features dual USB 2.0 HUB ports, allowing you to connect other USB devices such as a U disk, drawing board, Bluetooth receiver, gamepad wireless receiver, or other peripherals directly to the keypad, effectively expanding your available USB ports.
Hot-Swap Switches
The MMD KM21Pro features full key hot-swap sockets, allowing you to easily replace the key switches without soldering. This enables customization of typing feel and sound.
Figure 3: Hot-swap sockets for easy switch replacement.
System Compatibility
The keypad is compatible with:
- Windows 7/8/10 or above
- macOS 10.14.6 or above
Operating Instructions
Customizable Rotary Knobs
The MMD KM21Pro is equipped with up to four customizable rotary knobs. These can be programmed via the VIA software for various functions, such as volume control, zooming, color toning in design software, or other multimedia controls.
Figure 4: Custom rotation buttons for enhanced control.
VIA Software Customization
Unlock the full potential of your KM21Pro by customizing key assignments and knob functions using the VIA software. This allows for personalized macros and shortcuts, making the keypad ideal for various applications.
Figure 5: VIA software interface for key and knob customization. Visit mmdkm.github.io for software and instructions.
Application Scenarios
The MMD KM21Pro is designed for a wide range of uses, including:
- Graphic Design Software (e.g., Photoshop): Layer adjustment, file operations, editing, filter adjustment.
- Video Editing Software (e.g., Premiere Pro): Time axis adjustment, file operations, layer adjustment, special effects adjustment.
- 3D Modeling Software (e.g., C4D): Command selection, parameter adjustment, object adjustment, file operations, editing.
- Music/Video Playback Software: Volume adjustment, progress control, previous/next track, quick operations.
- Competitive Gaming (e.g., League of Legends): Combo releases, skill combinations, keyboard macros.
- Daily Office Work: Copy/paste, save/switch, open/close applications.
Figure 6: Versatile application scenarios for the KM21Pro.
Maintenance
To ensure the longevity and optimal performance of your MMD KM21Pro keypad, follow these maintenance guidelines:
- Cleaning: Regularly clean the keycaps and the keyboard body with a soft, dry cloth. For deeper cleaning, remove keycaps and use compressed air to clear debris from between switches.
- Switch Replacement: When replacing hot-swap switches, use a switch puller to gently remove the old switch and carefully align and insert the new switch. Ensure the pins are straight to avoid damage.
- Storage: Store the keypad in a cool, dry place away from direct sunlight and extreme temperatures.
- Avoid Liquids: Keep liquids away from the keypad to prevent damage to internal components.
Troubleshooting
If you encounter issues with your MMD KM21Pro, try the following steps:
- No Response:
- Ensure the keypad is fully charged or connected via USB.
- Check the connection mode (Bluetooth, 2.4G, USB) and ensure it matches your device's connection.
- For 2.4G wireless, ensure the USB dongle is securely plugged into your computer.
- For Bluetooth, ensure the keypad is paired correctly with your device. Try re-pairing if necessary.
- Test on a different USB port or computer to rule out port or system issues.
- Keys Not Registering:
- Check if any keycaps are loose or switches are dislodged.
- If using hot-swap switches, ensure they are fully seated in their sockets.
- Clean any debris that might be obstructing the switches.
- Customization Issues:
- Ensure you are using the correct VIA software version for your keypad.
- Verify that the keypad is connected in a mode compatible with VIA (usually USB wired).
- Refer to the VIA software documentation on the official MMD KM21Pro GitHub page for detailed customization guides.
Specifications
Figure 7: Exploded view of the MMD KM21Pro components.
| Feature | Detail |
|---|---|
| Product Name | MMD KM21Pro Numeric Keyboard |
| Model | KM21Pro |
| Number of Keys | 21 Keys + 4 Rotary Knobs |
| Connectivity | Bluetooth, Wireless 2.4G, USB (Tri-Mode) |
| Interface Type | USB Type-C |
| HUB Function | Dual USB 2.0 Full Function HUB |
| Operation Style | Mechanical |
| Switches | Hot-swappable |
| Material | CNC Aluminum Alloy (Top Lid, Lower Cover) |
| Manufacturing Process | Anodic Oxidation, Electrophoresis |
| Rated Voltage | DC 5V |
| Working Current | ≤400mA |
| Dimensions (L x W x H) | 135mm x 85mm x 41mm (including knob) |
| Weight | Approx. 0.4kg |
| Battery | Included |
| Supported OS | Windows 7/8/10+, macOS 10.14.6+ |
MMD-INK Switch Specifications
Figure 8: MMD-INK Switch Specifications.
| Parameter | MMD-INK White Linear Switch | MMD-INK Green Tactile Switch |
|---|---|---|
| Type | Linear | Tactile |
| Trigger Pressure | 45±5gf | 55±5gf |
| Bottom-out Pressure | 50±5gf | 62±5gf (Peak Pressure) |
| Trigger Travel | 2.0±0.1mm | 2.0±0.1mm |
| Total Travel | 3.8±0.2mm | 3.1±0.2mm |
User Tips
- Experiment with different switch types to find your preferred typing feel, thanks to the hot-swappable design.
- Utilize the VIA software to create custom macros and keybinds for your specific workflow or gaming needs.
- Take advantage of the tri-mode connectivity to seamlessly switch between devices (e.g., desktop, laptop, tablet).
- The dual USB 2.0 HUB can be very convenient for connecting low-power peripherals directly to your keypad, reducing cable clutter.
- Explore the various color options (Black, White, Pink, Green, Silver) to match your setup's aesthetic.
Quality Assurance Notes
Please be aware of the following manufacturing characteristics:
- The front of the keyboard may have minor blemishes (e.g., pits, air bubbles, bumps, black spots) not exceeding 1mm in size. The sides and bottom may have up to 5 such blemishes not exceeding 1mm.
- At a 0.30-meter viewing distance, the exterior should show no obvious tool marks or scratches. Chamfers on workpieces and joints may have slight tool marks.
- The frosted acrylic bottom may contain very small particles or black spots, with a diameter of less than 0.5mm and a spacing greater than 50mm, with a quantity of no more than 5. Minor scratches may be up to 1mm wide and 5mm long, with a quantity of no more than 3.
- Normal tool marks, chamfers, and minor bumps internally are considered normal phenomena.
- The actual color received should be considered accurate. Images may show color differences due to screen, environment, and lighting. We strive to ensure color consistency.
The issues mentioned above are not considered grounds for return or exchange.
Warranty and Support
For technical support, warranty claims, or further assistance, please contact the seller or manufacturer directly through your purchase platform. Please have your purchase details and product model number (KM21Pro) ready.
For VIA software and customization resources, please visit the official MMD KM21Pro GitHub page: mmdkm.github.io.
