A downhole tool includes a downlinking system deployed in a downhole tool body having an internal through bore. The functional unit operates based on a power supplied by an external host through power supply lines and generates a control signal based on an amount of power consumption of the functional unit. The second fluid is sprayed from the rotating arm into the stream of first fluid that flows across the lands, and is thereby atomized. The transmitter transmits at least one wireless signal when the object is in the position. In exemplary embodiments, the keypad assembly is suitable for use in electronic devices such as a mobile telephones, calculators, hand-held computers, or the like, having single piece molded housings wherein the keypad assembly is at least partially encapsulated within the housing.