Bluetooth technology is a short-range wireless standard intended to replace wired connections between devices within about 30 feet of each other. It operates in the unlicensed 2.4GHz spectrum and supports data rates of 1-3 Mbps. Bluetooth devices are classified based on their range, with Class 1 having the longest range of up to 100 meters. Security is a priority in Bluetooth, with three different security modes defined to protect data being transmitted between devices.