Cobra RAD 390

Essential radar protection wherever you go

$119.95
$119.95

Building off the long legacy of Cobra excellence, the Cobra RAD 390 radar detector delivers the performance, reliability, and value you can count on. With improved range and performance, it provides the essential protection you need along with comprehensive awareness features.

Radar Accessories Promotion: Buy a new radar detector direct from Cobra and get any one Radar Detector Accessory at 50% off. Discount shown at checkout.

Building off the long legacy of Cobra excellence, the Cobra RAD 390 radar detector delivers the performance, reliability, and value you can count on. With improved range and performance, it provides the essential protection you need along with comprehensive awareness features.

Radar Accessories Promotion: Buy a new radar detector direct from Cobra and get any one Radar Detector Accessory at 50% off. Discount shown at checkout.

Cobra RAD 390
$119.95
- +
Discounts for Military, First Responders, Teachers and Students through
ID.me military, first responder, teacer and student discounts See Terms

Discounts for Military, First Responders, Teachers and Students through ID.me military, first responder, teacer and student discounts See Terms

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Essential protection, enhanced coverage

With the perfect balance of affordability and capability, the RAD 390 represents our commitment to keeping drivers on the road protected wherever they go.

1Enhanced coverage

More range and coverage over previous generation for increased awareness

2Extreme Mode capability

Unlocks quicker response times with higher sensitivity

3LaserEye® functionality

Detects laser signals from both the front and rear of your vehicle

4USB-C connectivity

Power and data capable, comes with cable and 12V car adapter

5Redesigned mount

With adjustable angle for more secure mounting

6Firmware updates

Ongoing firmware updates provide software support for improved longevity

What's in the box?

Included with every new Cobra RAD 390:

  • RAD 390 radar/laser detector
  • Mount adhesive
  • Mounting bracket
  • 12V vehicle adapter
  • USB-C to USB-C cable

Accessories & upgrades

With 7 parts & accessories available for Cobra RAD 390, customize your setup and be ready for any journey.

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Manuals, product assistance, and more

Find the information and product support you need all in one convenient location.

Access Support

RAD 390 Product Manual

Item # 0180019-1

Product Specs  

Unit Dimensions: 4.25” L x 2.75” W x 1.25” H (107.95mm x 69.85mm x 31.75mm)  

Unit Weight (lbs.): 4.8 oz. (136.1 g.)  

Individual Box Dimensions : 2.19” L x 5.10” W x 7.60” H (54.10mm x 129.54mm x 195.58mm)  

Individual Box Weight: 12.8 oz. (362.9 g.)  

Power:  

USB-C power input draws 500ma max. RAD 390 is compatible with all standard passenger vehicles and installs easily via your vehicle’s 12V power outlet or USB Type C connection. 

Master Case Specs (bulk sales)  

Master Pack Qty.: 4  

Master Pack Dimensions: 5.98” L x 9.72” W x 9.76” H (151.89mm x 246.89mm x 247.90mm)  

Master Pack Weight: 4 lbs. (1,814.37 g.)  

UPC #: 028377 10855 6 

Master Pack Barcode: 10028377108553 

What makes the Cobra RAD 390 different from the RAD 380?

The Cobra RAD 390 builds on the RAD 380 with improved detection performance, providing greater range and more reliable alerts. It also features a redesigned windshield mount for a more secure, easier installation, USB-C connectivity for modern charging and firmware updates, and Extreme Mode for maximum detection sensitivity when you need it most.

Does the RAD 390 connect to an app?

No. The RAD 390 does not feature Bluetooth® connectivity. However, you can still use the Drive Smarter® app as a standalone app on your smartphone to access features such as red light and speed camera alerts, community-reported road hazards, and shared threat reporting from other drivers. Because the RAD 390 does not connect to the app, alerts and settings are not shared directly between the detector and your phone.

Can the RAD 390 be updated?

Yes, the RAD 390 supports free firmware updates, allowing you to receive ongoing performance improvements and feature enhancements over time.  

What types of radar and laser signals does it detect?

The RAD 390 detects X, K, and Ka radar bands, as well as laser signals from both the front and rear using LaserEye® technology.  

Does it reduce false alerts?

Yes, the RAD 390 uses next-generation filtering to help identify real threats while minimizing alerts from automatic doors, traffic sensors, and other non-police sources.  

Is the RAD 390 legal to use?

Radar detector laws vary by state. The RAD 390 is legal for passenger vehicles in most U.S. states, but it is not permitted in Virginia, Washington D.C., or for commercial vehicles nationwide.  

Will this work with my car?

Yes, the RAD 390 is compatible with all standard passenger vehicles and installs easily via your vehicle’s 12V power outlet or USB Type C connection.  

How do I mount the RAD 390 in my vehicle?

The RAD 390 includes a redesigned adhesive windshield mount for a secure, low-profile installation. It’s easy to set up and stays firmly in place.  

Can I customize alerts and sensitivity?

Yes, the RAD 390 allows you to adjust sensitivity modes and filtering settings to match your driving environment and preferences.  

What is Extreme Mode?

Extreme Mode increases sensitivity for faster response times and improved detection range—ideal for highway driving where early alerts matter most.  

Does it require a subscription?

No subscription is required to use the radar detection features. The Drive Smarter® app is free to download and use.  

What comes in the box?

The RAD 390 includes the radar detector unit, adhesive windshield mount, power cord, and quick start guide.  

What kind of warranty does it have?

The RAD 390 includes a limited 1-year manufacturer warranty.   

See more radar detector FAQs

Compare models

Model
Overview
RAD 700i

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Flagship performance

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RAD 490i

RAD 490i

Long range detection

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RAD 390
THIS PRODUCT

RAD 390

Essential protection

Performance, reliability, and value you can count on. the perfect balance of affordability and capability.
LaserEye® Protection

Yes, Front and rear laser threat detection

Yes, Front and rear laser threat detection

Yes, Front and rear laser threat detection
Extreme Mode Capability

Yes

Yes

Yes
Display

Full-color OLED Display

White OLED Display

7-Segment LED
Power Connectivity

Barrel Connector

USB-C

USB-C
Mount Style

EZ Mag Mount™

Redesigned adhesive mount with installation film

Redesigned adhesive mount with installation film
Digital Signal Processing

Yes

Yes

No
Drive Smarter® App

Yes

Yes

No
Defender® Database

Yes

Yes *With Drive Smarter® App connected

No
Shared Detector Alerts

Yes

Yes *With Drive Smarter® App connected

No
GPS-Based AutoLearn® Intelligence

Yes

No

No
Firmware Updatable

Yes

Yes

Yes
Dual-Language

Yes, English / Spanish

Yes, English / Spanish

Yes, English / Spanish
Learn More
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Overall rating: 5.0 / 5 from 3 reviews.

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Reviews

Simple, Reliable, and Does Exactly What I Need

"I’ve been really happy with the Cobra RAD 390. It was extremely easy to set up and use right out of the box, and the controls are straightforward without a bunch of unnecessary complexity. What I like most is that it gives me the alerts I need without constantly becoming a distraction while driving. The detection range has been impressive, giving me plenty of advance warning, and the display is bright and easy to read at a glance. It feels well-built, works consistently, and does exactly what I bought it to do. For the price, I think the RAD 390 offers a great combination of performance, simplicity, and value. Definitely a purchase I’m happy with and would recommend."

— Tom P. (5/5)

Cobra RAD 390 Review

"I really appreciate you guys sending me one to review and use! I think it works great, I have numerous videos of it picking up speed traps."

— Mann P. (5/5)

Seems to work fine

"Have only used it few days, seems to work fine."

— Joseph T. (5/5)

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