Why are Bluetooth keyboards and mice so expensive? Which is better, Bluetooth mouse, keyboard or wireless mouse?

It depends on how you usually play ~ in fact, you can choose the wireless suite and plug in the receiver, which is cheap and easy to use. But the disadvantage of wireless is that it can't be without electricity, otherwise it may break down. I suggest you choose a brightly colored wireless suite. When the wireless is running out of power, he will prompt that it is very expensive, probably 1 10 yuan. There is only one receiver for the job.