... search, play, Monitor 2,Accurately judge the channel status 3,AGC 4-channel Voice LoggerAdopts parallel connection, allowing recording of analog ... no influence on two sides talk3, Accurately judge the channel status(Pickup/Hangup, Ring times, Open-circuit or ... in WINDOWS-standard WAVE formatRelated models:GXUSB-4R 4-channel voice loggerDevelopment Environment:Provides drivers in WIN2000/XP/vista ...