Cobra CPI 490

Compact 400 Watt Power Inverter


The CPI 490 is a compact power inverter that converts your vehicles 12V cigarette lighter into two grounded household AC outlets and a USB port. It allows you to power office equipment and most household appliances drawing up to 400 watts.

Discounts for Military, First Responders, Teachers and Students military, first responder, teacer and student discountsSee Terms

Our Community

One hundred million alerts shared and received each year from our community of Cobra drivers on the iRadar app.

Price Match Promise

Find a better advertised price online for any current Cobra product and we’ll match it within 30 days of purchase.

Free Shipping

Enjoy free shipping on orders $79 and up. Plus, free overnight shipping on all Elite Series models.

Simple Returns

Not satisfied? No questions asked. All products purchased factory direct come with a 30-day money back guarantee.

Technology You Need

From repairing televisions in a small garage to a world leader in consumer electronics—our 50 years of innovation allows us to deliver the technology you need for a modern driving experience.

Never Be Powerless

Be prepared for the unexpected with Cobra Power Inverters. Whether you're a game day tailgater, a professional driver, a leisure road-tripper, or the average Joe — we've got the power and innovative solutions you're looking for.

Power Where You Need It

Power up your next pregame, bring convenient appliances on your next road trip, or even turn your car into a mobile office.

400 Watts of Continuous Power

Get up to 400 watts in continuous power for most office equipment and household appliances with a peak operating power of 800 watts.

Grounded AC Outlets

Power up to 2 appliances with grounded outlets for each.

2.4 Amp USB Port

Charge your smartphone, tablet, and many other mobile devices from the convenient USB port.

Multiple Power Options

Power your inverter from your 12V cigarette lighter port or direct from your battery with the included cables.

Pentagon Protection™

Get 5 levels of protection against failures—thermal shutdown, reverse polarity, over-voltage, low voltage shutdowns, and a low voltage alarm.

Protection Circuitry

Your inverter includes protection circuitry for both the inverter and connected devices.

400 Watt Power

Get 400 watts of continuous power and 800 watts peak power

Multiple Power Sources

Power from your 12V cigarette lighter or vehicle battery

Grounded AC Outlets

Powers up to two household appliances or pieces of office equipment

Protection Circuitry

Inverter includes protection circuitry for all connected devices

USB Port

Includes a convenient USB port for charging most mobile devices

Road Trip Ready

Ideal for cross-country trips or RV enthusiasts

Item # CPI490

Weight:  1.05 lb (476.27 g)

Height:  6.50 in. (165.1 mm)

Width:  5.25 in. (133.35 mm)

Depth:  2.5 in. (63.5 mm)


400 Watts continuous power - 800 Watts peak power.

2 grounded AC outlets - Powers up to two household appliances.

2.4A USB port - Charge mp3 players, smart phones, tablets and many other USB-powered devices.

Cigarette lighter cord & direct-to-battery cables included - Provides power directly from vehicle battery.

Pentagon Protection™ - 5 levels of protection against failures: thermal shutdown, reverse polarity protection, over-voltage shutdown, low voltage shutdown and low voltage alarm.

The fan does not run

This is normal.  The fan will only run when needed, if the inverter starts to get hot.

The output voltage is low

The voltage from your inverter is a little different than the voltage in your home.  The voltage in your home is called a “sine wave”, while the voltage from the inverter is a “modified sine wave”.  Because of this difference, you will need a  meter that measures “true RMS” voltage.  If your meter does not measure “true RMS”, then it will read low.

If it does not say “true RMS” on the front of your meter, then it is not a true RMS meter and it will read low.

See More FAQs