DIY turns a wired keyboard into a wireless keyboard 

In this video, I'll teach you how to DIY your USB wired keyboard into an incredibly user-friendly wireless keyboard that supports one-click quick switching across multiple devices (like Windows and Mac), capable of handling fast switches between 8 devices.
Materials Needed:
One wireless conversion module WBT-V3, available at www.wscome.com/
One lithium battery, which can be sourced from an old power bank, a soft pack lithium battery, or a recycled 18650 battery. The key is that it fits inside the keyboard. A capacity of over 2500mAh is recommended, with no specific requirements for discharge capacity. The module has very low power consumption, and under normal circumstances, the battery life depends on the keyboard's power consumption.
One ultra-thin switch, included free with the purchase of the WBT-V3 module.
Tools Required:
A soldering iron for soldering wires. Whether to use it depends on your modification method; it can be omitted if not needed.
A multimeter for locating the USB wiring. You can substitute this with a homemade test light or other methods.
Key Points:
Be cautious not to reverse the positive and negative poles, as this will damage the module.
When securing the battery, be aware that the solder points on the back of the keyboard's circuit board might puncture the battery. Use cardboard as a spacer to prevent this.
If there isn't enough space inside the keyboard, you can cut the interior with a utility knife. Use a new blade for easier cutting.
For the use of micro switches:
A single short press turns the keyboard on, and two consecutive presses turn it off.
For the use of ultra-thin surface-mount switches:
They can only be used to turn the keyboard on. To turn it off, use the key combination Ctrl+Alt+Shift+F12 and hold for 5 seconds.
The module features a sleep function that will automatically power off after a period of inactivity. The sleep wait time can be adjusted through software.
If you have any good suggestions or ideas, please contact me. I am very willing to consider your thoughts.