A radio frequency identification (RFID) inventory device attached to a container for tracking quantities of objects stored in the container having an antenna supporting wireless interrogation by an external RFID reader, a RFID chip coupled to the antenna having an embedded unique identifier and a memory element, where the RFID chip is adapted to store in the memory element at least one quantity value and to allow an external reader to wirelessly collect the identifier and at least one quantity value in response to said wireless interrogation, and one or more sensors coupled to the RFID chip, where the sensors are configured to send at least one signal to the RFID chip in response to a change in quantities of objects in the container and where the RFID chip is configured to update at least one quantity value stored in response to a signal from the sensors.