✅ Yes, the Hikvision DS-7616NXI-K2 NVR fully supports 5MP IP cameras that have night vision and audio features.

The NVR supports up to 16 channels of IP cameras with resolutions up to 4K, so 5MP cameras are well within its capability.

It supports two-way audio if your cameras have built-in microphone and speaker.

Compatible Hikvision 5MP camera models with night vision & audio features include:

Hikvision DS-2CD1653G0-IZ (with audio input/output)

Hikvision AcuSense 5MP series cameras with audio support

Night vision is supported via IR LEDs or ColorVu technology depending on the camera.

Ensure cameras are connected via Ethernet and configured in the NVR interface for audio channels.

📌 Ideal Use Cases in India:
Office and retail store surveillance with audio monitoring

Warehouses requiring night-time clarity and sound detection

Residential complexes needing multi-camera setups with audio alerts

✅ The Hikvision DS-7616NXI-K2 NVR supports audio input on multiple channels, but audio support depends on the camera and the number of available audio input ports.

Typically, this NVR supports up to 4 audio input channels physically via its dedicated audio input ports.

However, IP cameras with built-in audio (microphone & speaker) can stream audio digitally over the network, enabling audio on all connected IP camera channels that support it.

So, if your 16 connected cameras support audio streaming, the NVR can receive and record audio from all cameras via IP, but physical audio input ports are limited.

For Indian surveillance setups requiring audio on all 16 channels, IP cameras with built-in network audio streaming are recommended.

📌 Key points for Indian users:
Use IP cameras with built-in mic & speaker for full 16-channel audio coverage.

Ensure proper network bandwidth to handle video + audio streams.

This NVR is well-suited for offices, warehouses, and residential complexes needing multi-channel audio surveillance.