1. A tracking device, comprising: a telecommunication transceiver; a WiFi receiver; and a microcontroller, configured to operate the telecommunication transceiver to transmit WiFi information to a server during a data-collection period for behavior analysis of a tracked object equipped with the tracking device and for safe-zone demarcation of the tracking device, wherein: the WiFi information indicates WiFi access points detected by the WiFi receiver; and the safe-zone demarcation of the tracking device is adaptive to habitual behaviors, obtained from the behavior analysis, of the tracked object.