Features 1.4 channel Mic. inputs, 2 channel line inputs, separated treble and bass control. 2.6-channel zone output, zone volume is independently controlled. 3.Built-in bell, the bell tone is optional, 4 tones and 2 tones (built-in), the alarm generator. 4. MP3 decoder module supports USB / SD / Bluetooth / FM radio playback. Configuring MP3 remote control, support memory function without power input, MIC recording function. 5. When start the built-in generator, the background will turn off and 6-channel zone output will automatically turn on, switch to maximum output volume function. 6. Built-in 24V DC power input 7. MIC1- 4 built-in 48V phantom power and independent control switch. 8. T-216 remote microphone can remote control zone output, the maximum cascade 6pcs Mic. 9. The audio input with separate control, tone control and master volume control 10. A variety of LED display (signal, clip, protection LED indicator) 11. With fan forced cooling structure, to ensure the device to keep long time working 12. There are five priority levels: EMC with top priority: When there is EMC alarm signal input, it overrides all audio, 6 zone outputs open automatically. The 2nd priority level: TEL / REM MIC is priority to MIC1-4, LINE1-2,chime.The 3rd priority level: built-in alarm generator is priority toMIC1-4, LINE1-2, 6 zone outputs open automatically. The 4th priority level :built-in chime is priority to MIC1-4, LINE1-2. The 5th priority level :built MIC1 is priority to MIC2-4, LINE1-2. 13. The constant voltage output: 70V, 100V, constant impedance output: 4-16Ω