AlohaSafe Alert uses the GAEN protocol, which is based on low-energy Bluetooth technology. Devices running the AlohaSafe Alert app “ping” each other, measuring the strength of Bluetooth signal, distance of each device and the duration of interaction. If an individual has tested positive, other devices that meet criteria for an “exposure” will receive a notification that the app user may have been exposed to COVID-19, and will be directed to additional information and resources.