... video compression 16 channels D1 video input RJ45,RS232,RS485 interface 8pcs SATA hard disks D1 resolution 16-CH NVR For ... outputPre-recordingSupportInterfaceCommunication InterfaceRJ45,RS232,RS485USB interface2 USB interfaces: one for USB flash /USB HDD; the other for USB mouse SATA interface8pcs SATA hard disks ...