Here is how the Earfun Air Pro 4 and Air Pro 3 compare, so you know what upgrades the newest generation of cheap earbuds bring.
https://www.techradar.com/audio/earfun-air-pro-4-vs-earfun-air-pro-3-comparing-the-two-cheap-earbuds
https://www.techradar.com/audio/earfun-air-pro-4-vs-earfun-air-pro-3-comparing-the-two-cheap-earbuds