... USB Telephone Recorder 1,high-impedance recording 2,Accurately judge the channel status 3,Supports AGC 4,FSK, DTMF code 8-channel Telephone RecorderTelephone recorder ... kinds of audio, radio and carrier phone. GXUSB-R telephone recorder records with clear tone quality, is easy to install ... during call11, Supports automatic recovery after hot-swap and USB port error 12, Drivers is based on event-driven, ...