The detection system monitors WiFi wireless communications at a wireless device and detects a probe request associated with a location. The WiFi device may be a dedicated presence detection device or may offer access to internet and other services as a WiFi access point. A device identifier associated with the originating device may be a component of the probe request. Using the device identifier, the system can detect the presence of a consumer at the location associated with the wireless communications device and transmit information to the consumer based upon the device identifier.