Abstract: The present disclosure is directed to a transmitter having a minimal size and weight with acceptable output and life performance. The transmitter may be powered by a single 1.5V battery, rather than two 1.5V batteries in series, by electrically connecting a capacitor and voltage inverter to the microcontroller. The transformer to power the transmitter's ultra-sonic piezo transducer can be eliminated by the inclusion of an inductor selected to cause a resonance matched condition. A capacitor can be placed in parallel with the transducer to match the impedance to the inductor. The transmitter may have a power output of +156 dB (re: 1 uPa @ 1 meter), and certain physical properties, including a volume of 115 mm3; a dry weight of 280 mg; and an activated life (@ 5 sec PRI) of 35 days and an activated life (@ 3 sec PRI) of 23 days.