Bluetooth was designed for short-range communication. It has a range of up to 100 meters. It is widely adapted to a multitude of applications. Bluetooth is among the most energy efficient technologies on the market. Bluetooth low energy is a power-efficient version of Bluetooth that was introduced in 2010. BLE has allowed developers to create small devices that can run for years on tiny coin-cell batteries. These devices called beacons transmit a nearly continuous radio signal, usually a few times every second. It’s like a radio station that plays only one song, over and over. This signal tells smart devices the beacon’s ID number. The number is then sent to a cloud server in order to find the data related to that beacon.