A low profile, flip-top closure for a container having a top piece, a bottom piece and a joining region. The request includes data indicating a particular service extension is mandatory. The first differential amplifying section outputs a first amplified voltage based on the first bias current. An ultrasonic wave generator is provided above the edge section for generating ultrasonic waves. A response to the signal from the acoustic system can be provided by generating an echo pulse with the testing device based on the detected at least one Doppler pulse wherein the echo pulse is frequency shifted from the detected at least one Doppler pulse and mimics a response to the detected at least one Doppler pulse for a selected acoustic probe.