The number of sockets (ports) for RS-232. An RS-232
serial port was once a standard feature of a personal computer, used for
connections to modems, printers, mice, data storage, uninterruptible power
supplies, and other peripheral devices. Now it has been largely replaced by USB
and other ports.
Bluetooth is a low-power radio technology developed
to replace the cables and wires currently used to link or connect electronic
devices such as personal computers, printers, and a wide variety of handheld
devices including mobile phones. Because it uses radio-wave connectivity, a
Bluetooth-enabled device has a constant, established connection to whatever
browser it uses. This saves the user the trouble of logging on to check for
emails or news updates, for example.
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