Bluetooth v.1.1: in 1994, Ericsson launched a study to investigate the feasibility of a new low-cost interface for interconnecting consumer radio (thus removing cables) between devices such as mobile phones and other accessories. The study was based on a larger project investigating a multicomunicadores connected to a cellular network, until it reached a binding short-range radio, called MC link. As the project progressed it became clear that this type of link could be widely used in many applications because it had as its main virtue was based on a radio chip. Bluetooth v.1.2: Unlike 1.1, provides a wireless solution to co-exist complementary Bluetooth and Wi-Fi in the 2.4 GHz spectrum, without interference between them. Version 1.2 uses the technique “Adaptive Frequency Hopping (AFH), which runs a transmission more efficient and stronger encryption.To improve the experiences of users, V1.2 offers a quality of voice (Voice Quality – Enhanced Voice Processing) with less noise and provides faster setup communication with other Bluetooth devices within range of the scope, such as PDAs, HIDs (Human Interface Devices), laptops, desktop computers, headsets, printers and cell phones. Bluetooth v.2.0: a specification created to be separate, mainly incorporates art “Enhanced Data Rate (EDR) which can improve transmission speeds up to 3Mbps while trying to solve some errors in the 1.2 specification. Bluetooth v.2.1: simplifies the steps to create the connection between devices, as well as power consumption is 5 times smaller. Bluetooth v3.0 (mid 2009) significantly increases the speed of transfer. The idea is that the new Bluetooth work with WiFi, so it is possible to achieve higher speeds on smartphones.