Bluetooth is an industrial standard for personal near field communication(PANs), developed first by Ericsson in 1994. Later, it was formalized by Bluetooth SIG, and was officially announced on May 20, 1999. Within Bluetooth SIG, Sony Ericsson, IBM, Nokia, Toshiba are participating. Bluetooth, called as IEEE 802.15.1, is an industrial standard of PANs(Personal Area Networks), and was developed by Ericsson(Sony Ericsson), later, it was formalized by the Bluetooth SIG (Special Interest Group). Bluetooth lets many devices communicate with each other using radio frequencies usable worldwide in safety, and at a cheap price. The name of Bluetooth was derived from Herald Bluetooth, King of Denmark in the 10th century, and was especially famous for his negotiations with opposition parties. Thus, it is a suitable name for this technology which makes the communication between devices possible. Bluetooth uses 2.45GHz, ISM band, and in the case of versions 1.1, and 1.2, its speed reaches 723.1kbit/s. Version 2.0 has a characteristic of EDR, and through it, the 2.1 Mbit/s speed is available. Bluetooth is a concept which substitutes cable USBs, and Wi-Fi is a concept which substitutes for Ethernet. In the encryption, SAFER(Secure And Fast Encryption Routine)+ is used, and to make the reliable connection between devices, the pairing is accomplished using a key word, but, there may not be this course.