Abstract: A system for data transmission for an explosive environment comprises an ultrasonic transmitter coupled to a Class 1 device disposed inside an explosive risk zone and adapted to generate an electric signal in response to a predetermined condition, the ultrasonic transmitter being configured to generate and transmit an ultrasonic signal in response to receiving the electric signal, an ultrasonic receiver disposed outside the explosive risk zone configured to receive the ultrasonic signal, and an uplink communication device adapted to communicate an alert to a remote operator in response to the ultrasonic receiver receiving the ultrasonic signal.

Abstract: A controlling party can set limitations on a controlled party's access to applications operating on the controlled party's wireless mobile communication device. The controlling party can effectuate these limitations via various different mechanisms. In one instance, the controlling party uses another wireless communication device to effectuate the limitations. In another instance, the limitations are effectuated by the controlling party's operation of a data apparatus connected by a wired data communication bus to the controlled party's wireless mobile communication device. In a still further instance, the controlling party effectuates the limitations by accessing a website supported by a web server.