Isingeniso
Thank you for choosing the KEYCOOL K21 Mechanical Numeric Keypad. This versatile keypad offers triple-mode connectivity (wired, Bluetooth 5.0, and 2.4GHz wireless), hot-swappable switches, and customizable RGB lighting. Designed for efficiency and comfort, it is compatible with a wide range of operating systems including Windows, Mac, Linux, Android, and iOS. This manual provides detailed instructions to help you set up and operate your new keypad effectively.
Izici Eziyinhloko
- Triple Mode Connectivity: Seamlessly switch between wired (USB-C), Bluetooth 5.0, and 2.4GHz wireless modes for flexible use across multiple devices.
- Ukushintsha Okushisayo Okushintshayo: Customize your typing experience by easily changing 3-pin or 5-pin mechanical switches without soldering.
- Ukukhanyisa kwe-Dynamic RGB Backlighting: Personalize your keypad with adjustable and customizable RGB lighting effects.
- Umklamo Wokufaka I-Gasket: Enjoy a pleasant typing sound and feel thanks to the gasket-type installation structure with PORON foam tape.
- Idizayini ye-Ergonomic: Features a sloped keyboard and durable PBT keycaps for comfortable and long-term use, ideal for financial accounting and general data entry.
- Okhiye Abahlelekayo: Customize key functions and lighting effects using the dedicated software.
Okuqukethwe Kwephakheji
Sicela uhlole iphakheji ngezinto ezilandelayo:
- KEYCOOL K21 Mechanical Numeric Keypad
- Ikhebula le-USB-C kuya ku-USB-A
- 2.4G Wireless Receiver (stored in the keypad)
- I-Keycap Puller
- Shintsha i-Puller
- Spare Mechanical Switches (quantity may vary)
- Incwadi Yomsebenzisi (le dokhumenti)

This image displays the standard accessories that come with your KEYCOOL K21 keypad, including the USB-C cable for wired connection and charging, tools for switch and keycap removal, and additional switches for customization.
Setha
1. Power On/Off and Ports
Locate the Keyboard ON/OFF switch, Type-C Port, and 2.4G slot on the side of the keypad.

This image illustrates the physical layout of the keypad's side, showing the power switch, the USB-C charging and wired connection port, and the storage slot for the 2.4G wireless receiver.
2. Izindlela Zokuxhumana
The K21 keypad supports three connection methods:
- 2.4GHz Imodi engenantambo:
- Turn on the keypad using the ON/OFF switch.
- Remove the 2.4G wireless receiver from its storage slot.
- Xhuma umamukeli embobeni ye-USB etholakalayo kukhompuyutha yakho.
- The keypad should automatically connect. An indicator light will confirm the connection.
- Imodi ye-Bluetooth 5.0:
- Turn on the keypad.
- Cindezela bese ubamba i Fn key and a designated Bluetooth key (e.g., Fn + 1, Fn + 2, noma Fn + 3) to enter pairing mode. The indicator light will flash rapidly.
- On your device (laptop, tablet, smartphone), enable Bluetooth and search for "KEYCOOL K21" or a similar device name.
- Select the keypad to pair. The indicator light will become solid once connected.
- The keypad can store up to three Bluetooth device pairings.
- Imodi enentambo:
- Connect the USB-C end of the provided cable to the keypad's Type-C port.
- Connect the USB-A end to an available USB port on your computer.
- The keypad will automatically switch to wired mode and begin charging.
3. Ukufakwa komshayeli kanye nesofthiwe
For full customization of key functions and RGB lighting, it is recommended to install the KEYCOOL K21 software. The official driver download site is:
Sicela uvakashele i- website to download the latest software compatible with your operating system. Follow the on-screen instructions for installation.

This image provides the web address for downloading the necessary drivers and software for the KEYCOOL K21 keypad, enabling advanced customization features.
Imiyalelo yokusebenza
1. Basic Keypad Functions
The K21 keypad features standard numeric keys, arithmetic operators, and additional function keys. The Num key activates or deactivates the numeric lock function.
2. Ukulawula Ukukhanyisa kwe-RGB
The keypad offers various RGB lighting effects and colors. Use the following key combinations:
- Fn + Emuva: Turn ON/OFF the backlight.
- Fn + 6: Switch between different lighting effects.
- Fn + 7: Switch between different lighting colors.

This image highlights the hot-swappable nature of the switches and provides a visual guide to the function key combinations for controlling the RGB backlight effects and colors.
3. Amaswishi Okushintshana Okushisayo
The K21 keypad supports hot-swappable 3-pin and 5-pin mechanical switches. To change a switch:
- Khipha ngokucophelela ikhephu yokhiye usebenzisa i-keycap puller enikeziwe.
- Use the switch puller to gently grip the top and bottom clips of the switch.
- Donsa iswishi iqonde phezulu ukuze uyisuse ku-PCB.
- Hlanganisa amaphini eswishi entsha nezimbobo eziku-PCB. Qinisekisa ukuthi amaphini aqondile.
- Cindezela iswishi entsha ngokuqinile endaweni ize ichofoze.
- Shintshanisa ikepisi yokhiye.

This image visually demonstrates the hot-swappable capability of the KEYCOOL K21, showing how switches can be easily removed and replaced without soldering.

Lo mdwebo unikeza ukuqhuma view of a mechanical switch, detailing its internal components and highlighting features like quick triggering, tactile feedback, and distinctive sound.
4. Programmable Keys and Software
Utilize the KEYCOOL K21 software (download from www.kc-keycool.com) to remap keys, create macros, and customize lighting effects. The software allows for advanced personalization to suit your workflow.

This image displays various screens of the KEYCOOL K21's customization software, illustrating options for key remapping, macro creation, and lighting adjustments.
5. Volume Roller
The integrated rotary knob functions as a volume roller for your connected PC or iPad. It can also be programmed as an additional button via the software.
Isondlo
- Ukuhlanza: Use a soft, dry cloth to wipe the keypad. For deeper cleaning, remove keycaps and use compressed air to clear debris. Avoid liquid cleaners directly on the switches or PCB.
- Ukunakekelwa kwebhethri: To prolong battery life, avoid fully discharging the keypad frequently. Charge it when the low battery indicator appears.
- Isitoreji: Store the keypad in a cool, dry place away from direct sunlight and extreme temperatures.
Ukuxazulula inkinga
1. Keypad Not Responding
- Hlola Amandla: Ensure the keypad is turned ON and has sufficient battery charge.
- Ukuxhumana:
- 2.4GHz: Verify the receiver is securely plugged into a USB port. Try a different USB port.
- I-Bluetooth: Re-pair the device. Ensure Bluetooth is enabled on your host device and the keypad is in pairing mode.
- Intambo: Ensure the USB-C cable is properly connected to both the keypad and the computer. Try a different cable or USB port.
- Setha kabusha: If unresponsive, try resetting the keypad by holding Fn + Esc imizuzwana emi-5.
2. Driver Issues / Software Not Detecting Keypad
- Ensure you have downloaded the correct driver from www.kc-keycool.com.
- Connect the keypad in wired mode when attempting to use the software for the first time or if experiencing detection issues.
- Check your device's Device Manager (Windows) or System Information (Mac) to see if the keypad is recognized, even if with a "driver error." Reinstalling the driver may resolve this.
3. Ukukhanyisa kwe-RGB Akusebenzi
- Ensure the backlight is turned ON using Fn + Back.
- Check battery level; low battery might disable RGB.
- Use the software to verify RGB settings.
Imininingwane
| Imodeli | K21 |
| Isakhiwo | 21-Key Numeric Keypad |
| Ukuxhumana | I-Bluetooth 5.0, 2.4GHz Engenantambo, Intambo ye-USB-C |
| Shintsha Uhlobo | Mechanical (Hot-swappable 3-pin/5-pin) |
| Ukukhanyisa ngemuva | I-RGB |
| Amandla ebhethri | 1500mAh |
| Izinga Lokuvota | 1000Hz |
| Amasistimu Ahambisanayo | I-Windows, i-Mac, i-Linux, i-Android, i-iOS |
| Okubalulekile | Plastic, Foam (PBT Keycaps) |
| Ubukhulu | Cishe. 3.62 x 5.35 x 1.61 amayintshi (9.2 x 13.6 x 4.1 cm) |
| Isisindo | Cishe. 0.48 lbs (0.22 kg) |

Lesi sithombe sihlinzeka ngokubuka ngaphezuluview of the KEYCOOL K21 keypad in a typical usage scenario, accompanied by a summary of its key specifications including model, layout, battery, polling rate, weight, size, and system compatibility.
Iwaranti kanye Nokusekela
The KEYCOOL K21 Mechanical Numeric Keypad comes with a Iwaranti Yonyaka Ongu-2 Yomkhiqizi kusukela ngedethi yokuthenga. Lesi siqinisekiso sihlanganisa amaphutha ezintweni zokwakha kanye nokusebenza ngaphansi kokusetshenziswa okuvamile.
For warranty claims, technical support, or any inquiries, please contact KEYCOOL customer service through the official webisiza (www.kc-keycool.com) or your point of purchase.