This document discusses iBeacons, which are small Bluetooth devices that transmit signals to trigger messages on nearby smartphones. It explains that iBeacons can detect smartphones within a range of 50-100 meters and provide precise location tracking. The document then provides details on how iBeacons work, why they are important for proximity marketing, examples of companies using them, and statistics on iBeacon adoption rates. It emphasizes the potential for iBeacons to improve the customer experience in retail stores through mobile messaging and interactive selling.