测谎仪包括计算机主机，受试屏幕与音响的设备，应答按钮，应答麦克风，及脑波电极与前置放大器。
The lie detector includes host computer, testing screen, audio and video instrument, answering button keys, answering microphone, brain wave electrodes and pre-amplifier.
然而，混乱的根源之一是拨动开关，这是我们不得不麦克风设置适当的操作（包括前置放大器）。
One source of confusion, however, was the toggle switch, which we had to move to the microphone setting (which includes a preamp) for proper operation.
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