4MP PoE Security Add-on Camera

Power over Ethernet
Audio Recording
IP66 Waterproof
Motion Detection


B400 cannot work independently. It works perfectly when connected to Reolink 8-channel NVR RLN8-410, 16-channel NVR RLN16-410, or Reolink PoE surveillance systems.

4 Megapixels Super HD

4MP B400 with 2560x1440 high resolution to capture beautiful and smooth 4-megapixel live video streaming and video clips than 720p and 1080p cameras. No details will be missed!

The video shared by Darryl M., a Reolink customer.

An Excellent Night Vision Camera

Great cameras aren't just measured by images in daytime. Reolink B400 security camera stands out for its incredibly excellent images at night.

18pcs Infrared LEDs enable long night vision distance (up to 100ft). B400 HD infrared night vision surveillance camera captures crystal clear video evidence of theft and vandalism that occur in low-light conditions where standard security cameras won't work.

  • 18pcs

    Infrared LEDs

  • 100feet

    Night vision*

  • 80°

    Viewing angle*

Motion Detection — Smartest Way for Alerts

Whenever a danger is detected, this IP surveillance camera will trigger alerts by immediately sending alert e-mails and pushing notifications to your device. It also captures and saves images/videos at the same time.

You can create specific motion detecting zones to monitor or NOT monitor certain areas as you want.

You can adjust motion detection sensitivity to reduce false alerts.

kit-email kit-app


Email photos or
30-second video clips


Push notifications to
your mobile device

Only 3 Simple Steps

Use Reolink App and Client to Access the Camera


Install free Reolink software on your device


Open to add the NVR and camera

View Camera

Click the camera to get Live View

Remote Access Has Never Been So Easy

Free Reolink App

Get live streaming and other control on your iOS or Android mobile device, so you stay informed whenever there is a thing.

Free Reolink Client software

View live feed, do 24/7 recording, playback video, and control several cameras directly on your PC or Mac.


When connecting the camera with Reolink NVR, you can access the cam on web browsers like IE, Google Chrome and Firefox.

You can stay connected from anywhere, and if there is a thing happening, you will receive emails and notifications, alerting you to dealing with the emergency timely.

PoE Makes Easier Wiring and Installation

The Power over Ethernet (PoE) is an advanced technology, which enables you to use a single network cable for both video and power transmission. Therefore, B400 PoE HD security IP camera makes the wiring simplified and installation easier. The best choice for DIY enthusiasts!

Easy PoE Security Camera 4K Ultra HD Surveillance Camera

PoE Camera
Only needs a network cable

PoE Security Camera

Non-PoE Camera
Needs both a network cable and a power adapter

Non-PoE Security Camera

Waterproof Work Perfectly Outdoor as Well as Indoor

Reolink B400 outdoor and indoor IP home surveillance camera is with an IP66 waterproof rating. So you can feel free to install it outdoors, like in your garage, backyard, or anywhere else. It can stand harsh weather conditions, including rain, snow, intense cold and heat.

Free Firmware Update — Easy, Quick and Flexible

Reolink firmware update for IP security cameras is very easy – download firmware on the firmware page and update the firmware on the client software. All is free! Learn more


Before upgrading, make sure the firmware you selected applies to the hardware version of your camera; improper firmware will result in compatibility issues. Click and learn:

How to Find out System Information via Reolink Software

To perform the upgrade step by step, click and learn:

How to Upgrade the Firmware for Reolink Products

Having issues upgrading? Please contact support@reolink.com.

*Data based on internal lab testing.

Compare with Similar Products

What’s in the Box & Setup Guide (with Video) What's in the Box

*The data on the pages above are obtained under specific test conditions. Actual use may vary.



Image Sensor

1/3" CMOS Sensor

Effective Pixels

2560x1440 (4.0 Megapixels)


f=4.0 mm Fixed, F=2.0

Angle of View

Horizontal: 80°, Vertical: 42°

Day/Night Mode

Auto Switchover

Min. Illumination

0 Lux (With IR Illuminator)

IR Distance

30 Meters (100ft)(LED: 18pcs/14mil/850nm)

Backlight Compensation


Noise Reduction






Mainstream: 2560x1440, 1080p, 720p; Substream: 640x360


Mainstream: 1024Kbps~6144Kbps; Substream: 64Kbps~512Kbps

Frame Rate

Mainstream@30fps, Substream@7fps



Built-in Microphone



One 10M/100Mbps RJ45

Network Protocol



Power Supply

DC12V & PoE (IEEE 802.3af, 48V Active)

Power Consumption

< 8W

Working Environment

-10°C~+55°C (14°F~131°F), Humidity: 10%~90%

Ingress Protection



Φ67x186 mm


415 g


Limited Warranty

2-Year Limited Warranty. For Support, Visit https://support.reolink.com/hc/en-us/.

The above data are provided by internal laboratories, and are obtained under specific test conditions. Actual use may vary due to settings, use conditions and environmental factors.