Hikvision 4CH NVR DS-7604NXI-K1/4P Systems Kit Mic&Speaker 8MP IR IP Camera Lot
NVR is 100% hikvision NVR. The 2-way Audio function: when connect with hikvision NVR, only have 1-way audio for microphone function, speaker function can't use. so we suggest buy below Uniview OEM NVR, then can compatible this speaker function.