... ,RS232,RS485 interface 8pcs SATA hard disks D1 resolution 16-CH NVR For IP Camera ModelYW9016NDVideo compressionH.264Video SignalPAL/NTSCVideo input16 ... local configurationAudioAudio compressionG.711(G.722 for talkback)Audio Input8-CH inputs,1 microphone inputAudio outputA:1 channels HEADPHONE 3.5 ... *550*185 1 pc/boxNet weight7.1kg(Without HDDs) 16-CH NVR For IP Camera