K21 Wireless Mechanical Numeric Keypad User Manual

1. Product Introduction

The K21 Wireless Mechanical Numeric Keypad is a versatile input device compatible with various systems and designed for ergonomic comfort. It features responsive mechanical switches and PBT keycaps, making it suitable for diverse applications such as daily office tasks, entertainment, and study. This keypad offers a convenient and efficient input experience with its tri-mode connectivity and customizable RGB lighting.

Figure 1: K21 Wireless Mechanical Numeric Keypad

2. Safety Precautions

To ensure safe and optimal use of your K21 keypad, please observe the following guidelines:

• Before use, ensure the device is in normal working condition.
• Avoid using the keypad in humid, high-temperature, dusty, or strong magnetic environments to prevent damage to internal components.
• Do not pour liquids, food crumbs, or other debris into the key gaps. If liquid is accidentally spilled, immediately disconnect the keypad, wipe it dry, and allow it to air dry in a well-ventilated area.
• Do not strike, drop, or squeeze the keypad forcefully to prevent damage to the casing, keys, or internal structure.
• When cleaning, use a dry and soft cloth to wipe gently. Avoid corrosive cleaners, alcohol, or other chemical reagents that may damage the surface coating.
• Minors should use this product under adult supervision to prevent equipment damage or personal injury.
• WARNING: Be aware of potential fire risks. Strictly follow charging and storage instructions. For disposal, consult your local authority's website for information on safe disposal of lithium-ion batteries.

3. Setup and Connectivity

The K21 keypad supports three connection modes: Wired (USB-C), 2.4GHz Wireless, and Bluetooth (BT3.0/BT5.0). Choose the mode that best suits your needs.

3.1. Connectivity Modes Overview

Figure 2: Multi-Device Connectivity Options

• Bluetooth (BT): Offers fast transmission and low power consumption for wireless convenience.
• 2.4GHz Wireless: Provides a faster response with less latency, ideal for gaming or demanding tasks.
• Wired (USB-C): A mainstream interface for stable, direct connection, with positive and negative pluggable design.

3.2. Connecting Your Keypad

1. Wired Mode: Connect the keypad to your device using the provided USB-C cable. The keypad will automatically switch to wired mode.
2. 2.4GHz Wireless Mode:
   • Ensure the 2.4G receiver is plugged into your device's USB port.
   • Press FN + 0 briefly to switch to 2.4G mode.
   • Long press FN + 0 to initiate 2.4G pairing if the connection is not established automatically.
3. Bluetooth Mode (BT1, BT2, BT3):
   • The keypad supports up to three Bluetooth devices.
   • Short press FN + 1, FN + 2, or FN + 3 to toggle between Bluetooth profiles.
   • Long press FN + 1, FN + 2, or FN + 3 to enter pairing mode for the respective Bluetooth profile. Search for "K21" on your device's Bluetooth settings and connect.

4. Operating Instructions

The K21 keypad features powerful FN function keys for multimedia control and lighting effects. Refer to the table below for key combinations.

4.1. FN Key Functions

Figure 3: FN Key Combination Chart

4.2. Backlight Effects

The K21 keypad features 9 colorful RGB backlight effects. Use the FN key combinations to customize your lighting experience.

Figure 4: Backlight Control Functions

• Switch Effects: Press FN + Tab to cycle through the 9 different backlight effects.
• Adjust Brightness: Use FN + + to increase brightness and FN + - to decrease brightness.
• Adjust Speed: Use FN + * to increase animation speed and FN + / to decrease animation speed.
• Toggle ON/OFF: Press FN + Num to turn the backlight on or off.

4.3. Mechanical Switch Types

The K21 keypad is available with either Blue or Red mechanical switches, offering different tactile and auditory feedback.

Figure 5: Mechanical Switch Characteristics

• Blue Switch: Features a strong paragraph sense, distinct clicking sound, and a pronounced mechanical feel, providing strong rhythm feedback.
• Red Switch: Offers a light touch, low sound, and a comfortable, smooth pressing sensation, ideal for quieter environments.

5. Maintenance

Proper maintenance ensures the longevity and performance of your K21 keypad.

• Storage: When not in use for extended periods, store the keypad in a dry, ventilated, and clean environment to prevent component aging.
• Cleaning: Regularly clean the surface and the gaps between the keys to remove dust and debris. Use a dry, soft cloth for cleaning.
• Protection: Avoid placing the keypad near sharp objects to prevent scratches to the casing and keys.

6. Troubleshooting

If you encounter issues with your K21 keypad, try the following troubleshooting steps:

• Unresponsive Keys or Abnormal Input: First, check the device connection status (wired, 2.4G, or Bluetooth). Ensure the keypad is properly connected or paired.
• Connectivity Issues:
  • For 2.4G, ensure the receiver is securely plugged in and try re-pairing by long-pressing FN + 0.
  • For Bluetooth, ensure Bluetooth is enabled on your device and the keypad is in pairing mode (long-press FN + 1/2/3). Try removing and re-adding the device in your system's Bluetooth settings.
  • For wired mode, ensure the USB-C cable is fully inserted and try a different USB port or cable.
• Backlight Not Working: Press FN + Num to ensure the backlight is turned on. Check brightness settings with FN + + and FN + -.
• Keypad Not Charging/Low Battery: Ensure the USB-C cable is connected to a power source. If the issue persists, try a different cable or charging port.
• Factory Reset: If problems persist, long-press FN + Esc for 3 seconds to restore the keypad to its factory settings.
• If the problem remains unresolved, consult the product's exclusive instruction manual (if a more detailed version is available) or contact customer support.

7. Specifications

Detailed specifications for the K21 Wireless Mechanical Numeric Keypad:

Figure 6: K21 Keypad Specifications

8. User Tips

• Customization: Experiment with different backlight effects and speeds using the FN key combinations to find your preferred aesthetic.
• Switch Swapping: Since the keypad is hot-swappable, consider trying different mechanical switches (Blue for tactile feedback, Red for linear) to match your typing preference.
• Multi-Device Use: Utilize the three Bluetooth profiles (BT1, BT2, BT3) to quickly switch between different devices like your laptop, tablet, and desktop without re-pairing.
• Battery Management: To maximize battery life in wireless modes, turn off the backlight when not needed using FN + Num.

9. Warranty and Support

For detailed warranty information and customer support, please refer to the official product documentation or contact the seller directly.

An official user manual in PDF format is available for download: View User Manual (PDF)

For further assistance, please reach out to the ATS Choice Store customer service.