Beacons are battery-powered, small sensors with low power consumption. Via Bluetooth they emit a radio signal within a regulated range of 0 to 70 m. You can place them at various locations inside and outside of the buildings. Properly configured sensors can operate without interruptions for over 3 years. When you pass near the beacon, it can contact the relevant application on your smartphone and give it specific instructions.
Sensors are delivered by Estimote. Learn more: estimote.com