This document discusses Estimote beacons, which are Bluetooth Low Energy devices that can transmit signals to nearby smartphones. It covers the different types of Estimote beacons and their specifications, as well as the iBeacon and Eddystone Bluetooth protocols. Examples are given of how beacons can be used for indoor navigation, retail applications, and location-based services. The document also provides an overview of implementing a beacon scanning app in Android using the Estimote SDK.