America’s Security Experts Since 1989    |   12 reasons to shop with us >


M-F 8am-6pm CT

9,000+ Reviews

Compact 4-Channel H.264 Mobile DVR

Compact 4-Channel H.264 Mobile DVR

Four alarm inputs and two alarm outputs are perfect for event triggered recording
  • Records D1 resolution @ 30 fps (on all four channels)
  • H.264 video compression
  • Multiple sensor inputs for speed, ignition and more
  • USB Mouse Control (Not Included)
Special Price $389.99 Regular Price $519.99
In stock
Four alarm inputs and two alarm outputs are perfect for event triggered recording
Ships same business day when ordered by 3:00 pm Central Time.
  • Free Expedited Shipping for most order over $299
  • Industry Leading Warranties + Expedited Exchanges
  • Hassle-Free 30-Day Money-Back Guarantee
  • Unlimited US-Based Technical Support

Product Information

Features, Description, Reviews, Q&A, Specs & Installation



This compact 4-channel DVR is only about an inch thick, but it delivers the performance you need for your mobile surveillance applications. The versatile unit can be installed under vehicle seats, below the radio compartment or in the trunk. The mobile digital video recorder has 4-channels and records 720 x 480 (D1) resolution at 30 frames per second — on all four video channels.

The MDVR21SD features H.264 video compression to maximize recording and consume less space on the SD card*. The unit also records in AVI files, which makes video offloading and playback easy as well. This device features 4 alarm inputs, and two alarm outputs for event-triggered recording, such as bus doors opening or closing, activation of signal lights, increased speed, sirens and more.

The DVR is equipped with a graphical, easy-to-use on screen display (OSD). This compact mobile DVR also features a tamper enclosure that locks over the top of it to prevent unwanted access to the device — for added security.

Note: The Ethernet port on the front of the DVR is for local access only (not for remote viewing).

* SD card is not included.

Key Features

Easy Offloading and Playback – DVR records in AVI format enabling easy offloading and playback—no conversion required. Simply pull out the SD card, put it back in an SD card reader and open up a Windows media file.

Record in Separate or Composite Quad Recording Modes – Dual recording modes enable you to choose separate or composite recording to suit your application needs. In separate mode, the device will record a separate video file for each camera, so when you remove the SD card, you’ll have four separate video files (one for each channel). Composite quad recording mode allows you to have one video file with a quad view, which cuts your resolution by a fourth but enables your recording time to go up by 4 times.

Configurable Video Recording Settings – Enable you to optimize video quality. You can individually select resolution, frame rate and various video quality settings for each of the four channels to optimize video quality and recording storage. For example, you can lower resolution and frame rate to get more recording time.

What's Included

  • Mounting bracket
  • Connecting cables
  • Locking mounting bracket
  • USB Mouse Control (Not Included)

This mobile DVR comes with a 1 year warranty and free lifetime US-based technical support.


More Information
Sensor Inputs 4
Alarm Outputs 2
Audio Channels 2
Ethernet Ports 1
SD Card Reader Yes
Channels 4
Compression Type H.264
Frame Rate (fps) 30
Max Resolution 720 x 480
Brand White Label
Warranty 1-Year


File Name File Size File Type
Data Sheet157 KBPDF
Manual3161 KBPDF
ViewPro User Guide624 KBPDF
Player Software12.6 MBZIP
Firmware5.32 MBZIP


IP Camera Bandwidth Calculator: Calculate bandwidth or system load for optimal performance of your network IP security.

Covert Compare Tool: Watch our sample videos to see which hidden covert cameras work best for your covert application.

Compare IR & Low Light Tech: See the difference between standard, super low lux, and IR CCTV security cameras.

Compare Lens FOVs: This handy FOV calculator will help you in determining which lens is right for your application.

Compare Video Frame Rates: Use this tool to compare video frame rate settings on video security DVR products.

DVR Storage Calculator: Determine how much storage you will need for your security DVR.

Lens FOV Calculator: Choose from multiple scenarios and focal lengths to find the lens will work for your application.

NVR Storage Calculator: Determine how much storage you will need for your NVR.

System ROI Calculator: Determine your potential losses without a Video Security System and how much you can save.

Voltage Drop Calculator: Calculates the final voltage for each cable gauge.

Volts/Watts/Amps Converter: Calculates either the volts, watts or amps if two of the values are known.