Phone Call Recording Device 1,Accurately judge the channel status 2, ... of detection is industry-leading level USB Phone Call Recording Device (GXUSB-2R)Features:1, USB interface, provides easy ... Related models: GXUSB-2R 2-channel Phone Call Recording Device GXUSB-2R+ 2-channel Recording/dialing/playing prompt BoxDevelopment ... C + + Builder,. NET, WEBProvides the source procedure as a programming example.