comma four
Select a harness to connect the comma four to your car.
Free ground shipping on all US orders. International shipping is $30 flat rate. See fine print below for details. Common shipping questions are answered on the FAQ.
Meet the comma four
comma four is the next generation comma hardware designed to live in your car. The comma four has three beautiful HDR cameras, two cameras to watch the road and one night-vision camera to see inside the car.
It runs openpilot, which can drive for hours without driver action.
Besides cameras, the comma four has a suite of connectivity and sensors including cellular LTE, Wi-Fi, an IMU, high-precision GPS, and microphones.
You need a car harness if you don't already have one, which is free with purchase of comma four. The car harness is our universal interface to your car. Use the car harness to connect your comma device to your vehicle.
In the Box
comma four
2ft OBD-C cable
2 mounts
On-device Storage
comma four includes on-board storage to store your drives.
Want your video footage saved for longer? – Sign up for comma prime for 1 year of cloud video storage.
comma four includes one free month of comma prime. To claim your free prime trial, log into comma connect. Once paired, you can see your recorded drives, SSH into your device from anywhere, and more.
Tech Specs
Max cooling for quiet sustained peak performance.
- LTE
- Wi-Fi
- High-Precision GPS
- OBD-C port (USB-C w/ CAN)
- USB 3.1 Gen 2 port
comma four is compatible with 325+ cars
A supported vehicle is one that just works when you install a comma device. All supported cars provide a better experience than any stock system.
View all 325+ cars
Try our 30-day money-back trial and see why 92% of buyers keep their comma four and why Consumer Reports rated us as the top ADAS system.
Fine Print
If for any reason you are dissatisfied with anything purchased at the comma.ai shop, ship it back within 30 days for a full refund. comma.ai/returns
If you intend to upstream support for a new car model, we may approve an extended return window. Open a ticket request at comma.ai/support.
ShippingFree Rush (UPS 2nd Day Air) shipping (US only); signature confirmation required. International shipping is a $30 flat rate; customs/duties/taxes are between you and your country. Please see FAQ for more information.
Warranty1-year limited warranty against hardware defects. Open and repair the comma four at your own risk. comma is not responsible for damages that may occur while repairing devices. We cannot provide shipping return labels for international devices. Any damage on arrival must be reported to comma support within 14 days of delivery.
SoftwareThe comma four does not ship with software capable of controlling a car. Open source software can be installed separately.
Windshield installationBefore using the device on your windshield, check the state and local laws and ordinances where you drive. Some state laws prohibit or restrict the placement of objects on the windshield of a motor vehicle. IT IS THE USER'S RESPONSIBILITY TO MOUNT THE DEVICE IN COMPLIANCE WITH ALL APPLICABLE LAWS AND ORDINANCES. Always mount your device in a location that does not obstruct the driver's view of the road. comma does not assume any responsibility for any fines, penalties, or damages that may be incurred as a result of any state or local law or ordinance relating to the use of your comma device.
comma four FAQ
We recommend the mount be centered on the windshield below the trim (see pictures in the Installation Guide). Be sure to leave enough room to remove the trim in the future. First, clean the windshield with the included alcohol wipe. Ensure the top of the mount is fully visible from the driver’s seat. Adhere mount: peel off the 3M tape’s cover on the mount. Press firmly in the center of the mount, then the edges to ensure no bubbles form.
Let the mount cure: the mount must cure for 48 hours before installing the comma device. Skipping this step will compromise the integrity of the mount.
The 3X mount may be difficult to slide onto the device before it’s installed on the windshield. This is expected and will be easier to do once the mount is installed and fully cured. Some force may be necessary to initially slide the device on the mount. Before applying any force, ensure the device mount is parallel to the mount on the windshield so it will slide in correctly.
IT IS THE USER’S RESPONSIBILITY TO MOUNT THE DEVICE IN COMPLIANCE WITH ALL APPLICABLE LAWS AND ORDINANCES.
From the FTC website: "Simply using an aftermarket or recycled part does not void your warranty. The Magnuson-Moss Warranty Act makes it illegal for companies to void your warranty or deny coverage under the warranty simply because you used an aftermarket or recycled part."
https://www.consumer.ftc.gov/articles/0138-auto-warranties-routine-maintenance
Contact your insurance provider directly; insurance coverage is between the user and their insurance provider. comma hardware users have been able to get coverage and discuss this on Reddit here.
Insurance companies are beginning to understand the safety benefits of ADAS and LKAS systems like openpilot and we have not heard of any providers rejecting coverage to comma hardware users.
Money-back trial
Every vehicle is a little different and the experience can be hard to describe which is why we offer this trial. If you don’t love the comma four, you can return it for a refund–no questions asked. All refunds must be initiated through comma.ai/returns within 30 calendar days of receiving your order.
Yes. We ask that you get your return device in the mail within 30 days of receiving it.
The buyer is responsible for international shipping costs to return a device. Please use tracking and insurance as we are not responsible for lost or stolen packages. Return information is provided by email after initiating a return at comma.ai/returns.