Abstract: The present invention is a container cap sensors, chips, transmitters, and receiver, to record, transmit, and receive data regarding the time intervals between when the container cap was last placed on or taken off of a container. The container cap is for use with pharmaceutical and other health care related vials, bottles and containers. The data transmission is used to monitor a patient's drug administration times and intervals, and allows the patient and/or the patient's caregiver to review the administration data. The container cap of the present invention is streamlined, easy to use, reliable, and inexpensive.