I've been noticing that increasingly mice seem to be coming as wireless mice with USB RF dongles. Why are manufacturers emphasizing proprietary dongles instead of USB wired or Bluetooth?
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Number one factor is simply convenience.
People like going wireless, you could re-post this question and ask, why are people using wireless internet more these days? Same answer.
Its convenient to go wireless, and most people don't consider a battery in these devices to be a problem, as most come with charging cradles or offer easy charge methods.
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