For satisfied with  customers' special demand of the 1.alarm sound index and its position,  the host  specially is  increased exterior alarm connect.
2. After exterior alarm orifice connect connect into  host, it send out of the voice will  be coincide with the host's  voice
3.standed voltage: DC12V
4.standed current: 230-310mA
5.exterior alarm connect
6. sound level: ≥110dB/300mm