D841 Series - 4K DVR with Advanced Motion Detection

Model Numbers: D841 Series, D841A81B, D841A81, D841A82B, D841A82

Whether you're upgrading an existing video recorder or thinking of purchasing a whole new Analog HD system, this latest 4K Ultra HD digital video recorder by Lorex meets all the demanding needs of modern-day security. Features such as 4K recording resolution produce visually accurate video footage with exceptional detail. Along with 4K recording, advanced person/vehicle detection, and smart home compatibility, this DVR combines active security with the convenience of hands-free voice control.

Works with Google Assistant

works with Amazon Alexa

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Apps / Software

Lorex App for Android

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Lorex App for iPhone

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Lorex Cloud Client for Mac

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Lorex Cloud Client for PC

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Video Player for MAC

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Video Player for PC

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D Series DVRs: Audio recording

Describes how to set up Audio recording

D Series DVRs: Backing up video recordings

D Series DVRs: Changing the recorder’s output resolution

D Series DVRs: Configuring hard drive overwrite

D Series DVRs: Configuring recording quality

D Series DVRs: Configuring smart motion detection

D Series DVRs: Playing back recorded video

D Series DVRs: Setting a recording schedule

D Series DVRs: Setting up email alerts

D Series DVRs: Smart search

D841 Series: Enabling voice assistance

DVR / NVR - How to format your USB flash drive on your recorder

To make sure you can transfer files to or from your recorder, it is essential that you first format your USB flash drive on the recorder before moving any file.

DVR / NVR - How to manually upgrade the firmware of your recorder

If your recorder is connected to a network, it will automatically receive firmware updates.

DVR / NVR - How to Playback Recorded Videos on Your Computer

You can download recorded videos from your DVR or NVR to a USB flash drive and play them back on your computer. Depending on the file format of your video, you need the Lorex Player or the VL

DVR / NVR - How to Remove and Install a New Hard Disk Drive

The system comes with a pre-installed 3.5" SATA hard drive. You can replace the hard drive with one up to a maximum size of 8TB or 10TB (varies per model).

DVR / NVR - How to restore your recorder’s display resolution to factory default

This troubleshooting guide will help you restore your recorder’s display output to factory default so that you can restore your monitor’s live view.

DVR / NVR - Which Hard Disk Drive (HDD) is Compatible with Lorex Recorders?

The following FAQ details which type of hard disc drive (HDD) is compatible with Lorex recorders.

How to Change or Reset Your Recorder's Password (Compatible with Lorex App)

This article offers guidance on how to change the password of your Lorex recorder for security purposes or reset it in case you have forgotten it.

Popular Client Software and Mobile Apps

This page contains the updated list of all our current Client Software and Mobile Apps.

Technical Support: Frequently Asked Questions

We have curated these frequently asked questions (FAQs) to provide you with a quick and easy solution to technical issues regarding your Lorex product.