A wireless patient monitor is adapted to communicate with any one of plural medical telemetry networks, each having one or more central stations, where each network is configured to communicate via wireless communications using one of multiple different communications settings. A shaft supporting gap of the throttle valve shaft is filled with an air leak preventing material, and a minimum opening degree of the throttle valve is set to a value larger than an amount of overshoot of the throttle valve occurring when the opening degree of the throttle valve is changed from a maximum opening degree to the minimum opening degree. The shielding member is covered on the first connector. The distal end portion of the second terminal is positioned farther away from the body than the distal end portion of the first terminal.