DESCRIZIONE
A scuba tank pressure monitor system comprises a scuba tank pod and a wearable electronic device. The scuba tank pod includes an air pressure detector, a first transducer element, and a first processing element. The air pressure detector detects an internal air pressure of the scuba tank. The first transducer element transmits sonar waves including scuba tank related status data having a first frequency range. The first processing element controls the first transducer element to transmit sonar waves including the scuba tank related status data. The wearable electronic device includes a second transducer element, and a second processing element. The second transducer element receive sonar waves including the scuba tank related status data from the scuba tank pod and transmits sonar waves including alert tones having a second frequency range. The second processing element controls the second transducer element to transmit sonar waves including the alert tones. [Image Omitted]