Hikvision 4-Channel AcuSense 4K Network Video Recorder, 1U K Series DS-7604NXI-K1(D)

What this recorder is for

An NVR (network video recorder) stores and plays back video from IP cameras over a network, where a DVR records analogue cameras over coax. This Hikvision model is for a small system of up to four cameras.

It can suit a home, shop or small office. An installer also gets a compact 1U unit, meaning one standard rack height, that sits on a shelf or in a cabinet.

How the recorder's technology works

• AcuSense: Hikvision's name for analysis that sorts movement into people and vehicles. Motion detection 2.0 runs on all channels, and perimeter protection on 1-ch at the recorder.
• AI by camera: where a camera does its own analysis, the recorder can use those events on all channels. ANPR, the reading of number plates, is one such function.
• H.265+: a compression method that can reduce the storage space by up to 75%, though real savings vary with the scene.
• Stream over TLS: encryption for video as it moves across the network, which makes it harder to intercept.

Where to use it

The -10 °C to 55 °C range suits a dry indoor space such as a comms cupboard or office. Keep it away from condensation, as working humidity is 10% to 90%.

As a rule, a locked cupboard helps, because taking the recorder also takes the footage.

What the figures mean in practice

• 40 Mbps in: add up the bit rate set on every camera, and keep the total within this figure.
• 80 Mbps out: this is the limit for video sent onward to remote viewers or playback clients at one time.
• Recording resolution: it accepts up to 12 MP, so a 4K (8 MP) camera is within its range.

Installing it

• Network: the 1 RJ-45 is the recorder's only network connection, so cameras reach it through your network.
• Screen: HDMI and VGA are independent outputs, and only HDMI goes up to 4K (3840 × 2160)/30 Hz.
• Two-way audio: this uses the audio input, through an RCA connection.
• Set-up: the web interface runs in Chrome V57, Firefox V52, Safari V12, Edge V89 or above.

Planning your system

As a rule, choose a surveillance-rated drive, as a recorder writes around the clock. Work out how many days you need before picking a size.

Add IP cameras that suit the site. PoE cameras can take power over their network cables from a PoE switch. Hikvision also makes an alarm version, the DS-7604NXI-K1(D)/Alarm4+1, with 4 alarm inputs and 1 alarm output.

Standards and ratings explained

• ONVIF profile S and G: an open standard for network video. Profile S covers streaming and G covers recording.
• UKCA: the UK's product conformity marking, which is among this recorder's certifications.
• EN 50130-4: an immunity standard for alarm equipment, covering electrical interference.