Also with the Queclink GL500N GPS tracker you can set up SMS alerts to receive in a mobile phone when detect following events: (geo fences for service routes or deliveries tasks control, internal battery is low, movement detect, device power on). GL500N of Queclink apart from serving to Mobile Asset control and automatic vehicle dispatch is a good option for the GPS Container tracking. Queclink GL500N is it also a GPS Tracker with Microphone / Speaker that allows you to listen when making a call from an added phone to the allowed list, ideal fo their field service management. Another interest function that have the GPS tracker GL500N of Queclink is that allows firmware update or configuration change via OTA (Over the Air), this function reduce maintenance costs, with GL500N you can also use an REST API to connect existing applications.