A:AnswerThis can be used by any computer that has a USB port. The USB thumb drive plugs into the USB port on your computer, and you simply switch them on. No install needed.
A:AnswerYes. It is UEFI compliant, so any operating system should work with it. Older BIOSes may or may not have problems with it, depending on the manufacturer.
A:AnswerYou'll get input and range issues with lower-power rechargeables, even with lower-draw BLE devices such as this. Make sure the batteries that you have are capable of providing an actual 1.5 vDC each. Some produce much less.