... compression Wireless 4ch with audio Built-in 7 inch LCD screen 4ch real-time video view 5.8G camera with ... IR cut ES-DVR704HV421W Camera paramiter:1/4" color CMOS camera,6mm lensResolution:648X488RGB10- ... channelVideo recordHard disk,remote record,USBBackup modeInternet,USB storage Wireless parameter(ES- DVR704FM)Frequency5.8GTransmission modeSimultaneously audio and ...