The disadvantage is that your Mac must have a Bluetooth adapter installed. The advantage of Bluetooth is that you don't consume a USB port and can communicate with many Bluetooth devices at the same time. The other type, such as the Apple Wireless Keyboard, uses Bluetooth. One type includes a transmitter you plug in to an USB port. Some keyboards are wireless two basic types of these devices are available. (And remember that, as you read in Chapter 21, "Understanding Input and Output Technology," USB devices are hot-swappable so you can connect and disconnect them without turning off the power to your Mac.) You can check out available keyboards by visiting the peripherals section at Many modern keyboards use the USB interface, so installing a keyboard is a trivial matter of plugging it in to an available USB port.
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