Nanny Bracelet. Nanny Bracelets are wearable devices designed to monitor the location and activities of a child or elderly individual. Nanny Bracelets are often equipped with GPS tracking technology and may have additional features such as an emergency button or the ability to make phone calls. Nanny Bracelets are connected to a mobile app or web portal that enables the caregiver to monitor the wearer’s location, set up safe zones or geofences, and receive notifications if the wearer leaves or enters those predefined areas. SEE MORE: Mermaid Glass Bracelet.