1. 2 channels AUX input, 3 channels MIC input, each channel is individual volume adjustment. 2. The first channel MIC having tiptop priority, convenient to insert broadcast on the emergency. 3. 1 channel emergency signal input port (EMC) will automatic process rest sound signal, priority emergency signal, furthermore connect external different kinds of jow, alarm sound and music signal. 4. Excellent strong wind and cold technique can ensure longtime and steady working under high temperature condition. 5. Complete overflow,overload,overvoltage,short circuit and high temperature of protection function. 6. Excellent 2U casing design, according with installation of standard cabinet. 7. 5 cells LED voltage level display and all kinds of protection indicator light. 8. Having manifold powers to 80W~800W. 9. Collocating record signal output interface, according to the facts to record signal and handing general control function, convenient to close broadcast, furthermore the amplifiers can longtime and steady work yet. 10. As preposing to individual use, connecting more power of simple amplifier.