Embodiments of the present disclosure include systems, methods, and devices for tracking a shipment using a wireless tracker. In such embodiments, the wireless tracker determines a location of the wireless tracker device and regulates battery usage of wireless tracker based on the location. In addition, the wireless tracker is configured to determine a current location of the wireless tracker device at one or more intervals such that the one or more intervals are based on a delivery route of the shipment. Moreover, the wireless tracker is configured to receive and verify one or more codes to for a chain of custody of the shipment. Also, the wireless tracker is configured to determine a trigger event based on the location of the wireless tracker device and/or sensor information as well as send a notification to a computer server based on the trigger event.