... at the same time• Backup: CD-RW (Option: DVD-RW), USB 2.0 and NET backup supported• PTZ camera control in ... Capacity from 40G to 4T in Total )Video Input4 channel, BNC , 1.0V p-p/75ΩComposite Video Output1 ... , Resolution: 800x600, 1024x768, 1280x1024, 1024x600 optionalAudio Input2 channel, RCAAudio Output2 channel, RCAAlarm Input4 Channel, Trigger closed without Voltage,Open or ClosedAlarm Output1 ...