The present invention provides a method and apparatus for maximizing throughput of a data call in a wireless communication system in which data is transmitted from a wireless station, such as a mobile station, on multiple assigned channels in accordance with a known transmission standard, such as IS-95B. The system comprises a printed circuit board having tamper-response electronics and a flexible circuit assembly defining a connector portion, a switch portion, and a cable extending between the connector portion and the switch portion. The enclosure is provided with two openings adjacent to each other, and the base plate or the opening of the enclosure is provided with the connection part. At least one holder member is assembled onto the position holes of the pad. A flow rate adjustment mechanism includes a throttle member threadably mounted on the shaft for movement relative to the shaft, toward or away from an annular seat having a discontinuous edge such that the flow rate cannot be shut off by having the throttle member engage the seat.