... and DTM 3,AGC 2-channel USB Telephone Call RecorderGXUSB-R series of telephone call recorder adopts parallel connection, allowing ... of audio, radio and carrier phone. GXUSB-R telephone call recorder records with clear tone quality, is ... installation for 1 PC: support 4 pieces box in 1 PCWorking Temperature: 0°C-55° ... Modulate Mode: Logical 0:2200Hz±1%Telephone line Status Judge Voltage: 50-90AV(Ring), 18 ...