If acquire the extra option for that AX7P OBDII tracker has (1 digital input), can connect an external "panic button" that generate SOS emergency messages when the driver of vehicle where you install the ATrack tracker feel any danger and click on the panic button. Depending of your needs, can use ATrack AX7P OBDII tracker of 3 different modes with hours of service control: (sending commands with SMS text messages, editing the IP/port for use an external tracking management platform, using ATrack online server). Another extra option that is highly recommended acquire to AX7P OBDII tracker, is the "Bluetooth 4.0 BLE" connectivity ideal for mobile applications and IoT solutions that needed connecting to an GPS tracker for send telematics information without connect any wire. Receiver different "visual and sound alerts" generates by the internal buzzer of ATrack AX7P OBDII tracker, when any of the preconfigured events are active, the (visual and sound alerts) also can send to ATrack server or to external tracking management platform. Thanks to "plug and play" installation mode of AX7P tracker, you save costs in maintenance services, only has that connect ATrack tracker to OBDII port of your vehicle and start your fleet management.