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8 Channel Telephone Call Recorder: Open-circuit or Short-circuit, Activity/Silence, Busy tone on line) 4, Supports three start-up modes respectively for voltage-controlled, sound-controlled and key-controlled 5, Supports caller ID ...

4 Channel Telephone Recorder: Open-circuit or Short-circuit, Activity/Silence, Busy tone on line) 4, Supports three start-up modes respectively for voltage-controlled, sound-controlled and key-controlled 5, Supports caller ID ...

2 Channel Telephone Recorder: Open or Short-circuit, Sonance or Slience) 5, DTMF and CID can be detected by hardware-decode, and automatically identifies two modes respectively for FSK and DTMF 6, Supports 5-times compressed ...

1 Channel USB Telephone Recorder: Open or Short-circuit, Sonance or Slience) 5, DTMF and CID can be detected by hardware-decode, and automatically identifies two modes respectively for FSK and DTMF 6, Supports 5-times compressed ...

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8 Channel Telephone Call Recorder