Bluetooth is a low-power radio signal specification that allows devices to communicate and exchange information on a smaller scale than Wi-Fi--using a personal-area network, or PAN. Bluetooth's practical throughput is roughly 500Kbps, and its real-world range is no more than 30 feet, making Bluetooth ideal for simple exchanges of information between devices. Bluetooth is also easier to use than Wi-Fi. Bluetooth devices that come within range of each other can communicate automatically with little or no setup. Common applications for Bluetooth include wireless keyboards and mice for notebook and desktop PCs; communication and file transfers between PCs and PDAs; wireless printing to a Bluetooth printer; and wireless headsets for cell phones. Newer applications include Bluetooth-enabled cars that communicate with Bluetooth-enabled phones, allowing for true hands-free phone operation in the car. Keep in mind, though, Bluetooth operates on the 2.4GHz band, the same as 802.11b/g/n, so it's subject to the same interference issues.