As I understand it, Estimote's main technical selling point is that it uses Bluetooth LE. So the "beacons" can be made cheap and low-power, plus you get out-of-

As I understand it, Estimote's main technical selling point is that it uses Bluetooth LE. So the "beacons" can be made cheap and low-power, plus you get out-of-the-box compatibility with modern smartphones.