... , 3. RS232/interface 485 4. 10W output every channel Multifunctional Timing Playback ControllerAn intelligent multifunctional playback controller set and ... input interfaces, an RS232 interface (interface 485), a two-channel 10W speaker output, as well as 3 group relay ... audio on demand, more responsive;Separate audio amplification system, dual-channel output, the adequate voice output, power up to 10W ...