What's the annoyance for wireless electronic device? Battery!
Wireless keyboard or blutetooth mouse all needs to have battery althought no bothering by the wire any more. But battery may go die quickly. To bring with an extra battery is kinda annoy and inconvenience.
Think about currently it is so popular for mp3 player and bluetooth earphone to use USB for charging and data transfer.
So why can not wireless keyboard or mouse? Since usb keyboard and mouse is also popular. So use USB to charge and also send the key signals to Computer is one-stone-two-birds success. But I prefer bluetooth keyboard/mouse since wireless keyboard may introduce another connector at the box side.
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