A total of 2 reviews of this product on Reddit.
2nd Dec 2021
Limited-time deal: USB Switch for 2 Computers Sharing 4 USB 2.0 Port Devices, USB 2.0 Peripheral Switch Box Hub for One-Button Swapping, Compatible with Windows Mac Linux, Powered by USB, with 2 USB Cables https://www.amazon.com/dp/B07W7QJ1YT/ref=cm_sw_r_apan_glt_fabc_dl_5GFYY4PG0TWJCXS4SPMD
Even a simple one like this I can get the keyboard to work but no indication of any mouse activity
17th Dec 2020
Check Amazon, there’s tons of options. You can even search for usb switch (KVM is keyboard video mouse and you don’t need the video). Something like this https://www.amazon.com/dp/B07W7QJ1YT/ref=cm_sw_r_cp_apa_fabc_7pU2FbPFYCP77?_encoding=UTF8&psc=1