Hongdian H3304 4CH Dual SD MDVR - Manual (Page 22)

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Audio speaker input/output
Audio speaker input/output port to connect audio speaker input/output cable.
Audio speaker input/output port
Audio speaker input/output cable
Number Pin definition
1 MICINP
3 MICINN
5 GND
2 OUT_L
4 OUT_R
6 5V OUT
Audio INTERCOM INPUT/OUTPUT interface