Abstract: One embodiment involves a usage code system comprising an electrical device powered by a battery only if the battery contains a characteristic usage code. Another embodiment involves a presence confirmation device that repeatedly sends wireless query signals. The electrical device receives the query signals and responds by sending a wireless confirmation signal to the presence confirmation device. The presence confirmation generates an alert if it does not receive the confirmation signal after a certain time period after sending a query signal to the electrical device. Yet another embodiment involves a motion sensor that measures motion data from which translation of an electrical device is determined. If a net translation of the device is greater than or equal to a defined threshold, an alert system generates an alert or increases a polling rate at which new motion data is periodically received from the motion sensor.