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Add：5/F,Tonggao Building A,Sanlian Industry Park,Shiyan,Baoan,Shenzhen,
China
Tel：0755-29993165
Fax：0755-29993375
EMail：sales@secu365.cn
Service：0755-29993167
> There is no audio signal in the surveillance window
Possible reasons are as followed:
1 .It is not an active tone arm
2 .It is not an active sound box.
3 .The audio lines are damaged.
4. The hardware of the DVR is damaged.
