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JFA Intelligent LED: The JFA INTELLIGENT LED is positioned under the JFA
logo and is responsible for informing the user of the JFA amplier's
operating status. On the AP400X4 and AP800X4 models, the LED is
switched on as soon as the amplier receives the Remote Control signal,
indicating that it is in operation. At any time, whenever adjustments are
made, the LED will also ash twice, indicating the setting of the adjusted
value.
Compact Design: With greater power density, JFA ampliers have a
robust and modern design, taking up the least amount of space in the
design of the car stereo.
AP400 AND AP800 AUDIO AMPLIFIER - INSTRUCTION MANUAL