The TW-100 is a portable personal tracker designed in a wristwatch style and intended for the surveillance of the safety of the elderly and children. Equipped with two microphones and a speaker, the device allows for hands-free two-way communication capability. The SOS button provides the ease of access for the user to call pre-set phone numbers and sends an SOS alert with a single press. The device allows the control center to remotely configure and track users immediately, as well as periodically by sending GPRS/SMS commands to the device. Geofence configuration is also available to create permissible areas or restricted areas to provide more flexible control options for the device user.