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Customer Ratings & Reviews

Your price for this item is $32.99
The comparable value price is $34.99

Customer reviews

Rating 4.4 out of 5 stars with 63 reviews

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Rating by feature

  • Value

    Rating 4.6 out of 5 stars

  • Quality

    Rating 4.5 out of 5 stars

  • Ease of Use

    Rating 4.7 out of 5 stars

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Cons mentioned filter

87%would recommend to a friend

Customers are saying

Customers frequently mention the M140BUC 140 W Power Inverter's excellent overall performance and compatibility with various devices. Positive feedback highlights its reliable operation and ability to power devices such as refrigerators and laptops. However, some users noted that the inverter produces some noise during operation and can get warm after extended use. These minor drawbacks appear to be outweighed by its generally positive performance.

This summary was generated by AI based on customer reviews.

The vast majority of our reviews come from verified purchases. Reviews from customers may include My Best Buy members, employees, and Tech Insider Network members (as tagged). Select reviewers may receive discounted products, promotional considerations or entries into drawings for honest, helpful reviews.
Page 3 Showing 41-60 of 63 reviews
  • Pros mentioned:
    Overall performance

    Rated 5 out of 5 stars

    PhilipC

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    Posted . Owned for 1 month when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    It works very well. The last one I bought that worked well, it was 14.99 ten years ago.

    I would recommend this to a friend
  • Pros mentioned:
    Charging speed

    Rated 5 out of 5 stars

    Power inverter

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    Posted . Owned for 1 month when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    Easy to plug in the car to charge a computer. You can charge your cell phone at the same time.

    I would recommend this to a friend
  • Rated 5 out of 5 stars

    car power converter

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    Posted . Owned for 10 months when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    great car adapter. allows for wall socket plugins. works great most of the time.

    I would recommend this to a friend
  • Cons mentioned:
    Noise level

    Rated 5 out of 5 stars

    Great!

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    Posted . Owned for 2 weeks when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    For such a small device, it wasn’t very loud and packed enough power to charge computers tablet, et cetera.

    I would recommend this to a friend
  • Pros mentioned:
    Overall performance

    Rated 5 out of 5 stars

    Quality of the item

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    Posted . Owned for 3 weeks when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    This item works great. I'm very impressed with the quality and quality of the item

    I would recommend this to a friend
  • Rated 5 out of 5 stars

    Vacation saver

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    Posted . Owned for 3 months when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    Needed it in a pinch while on vacation, works great !

    I would recommend this to a friend
  • Rated 5 out of 5 stars

    Amazing product

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    Posted .
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    Works amazing helps power my laptop in car love it

    I would recommend this to a friend
  • Pros mentioned:
    Overall performance

    Rated 3 out of 5 stars

    Charger.

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    Posted . Owned for 1 month when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    Good product works well. Very convenient would recommend

    I would recommend this to a friend
  • Pros mentioned:
    Overall performance

    Rated 5 out of 5 stars

    Laptop Charger

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    Posted . Owned for 2 months when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    Has been nothing but amazing! Work perfect no complaints!

    I would recommend this to a friend
  • Pros mentioned:
    Overall performance

    Rated 5 out of 5 stars

    Great for Traveling

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    Posted . Owned for 3 weeks when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    This works great, and for powering my laptop in my truck.

    I would recommend this to a friend
  • Pros mentioned:
    Overall performance

    Rated 3 out of 5 stars

    Perfect

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    Posted . Owned for 1 month when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    Not much to say about this product, but it works love it

    I would recommend this to a friend
  • Rated 5 out of 5 stars

    Charger

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    Posted . Owned for 3 weeks when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    Love it. Dependable. Helps with my daughter’s computer. So convenient.

    I would recommend this to a friend
  • Rated 5 out of 5 stars

    Bravo !!!

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    Posted . Owned for 1 month when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    Good price, The handy, the thing does it's job so quietly. So Amazing and recommend to anyone.

    No, I would not recommend this to a friend
  • Rated 4 out of 5 stars

    nice adapter

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    Posted . Owned for less than 1 week when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    Got this for a friend. They said it was a good buy

    I would recommend this to a friend
  • Rated 5 out of 5 stars

    Great charger

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    Posted . Owned for less than 1 week when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    A great charger to plug into the cigarette lighter and charge my computer while I’m on the road

    I would recommend this to a friend
  • Cons mentioned:
    Heat dissipation

    Rated 1 out of 5 stars

    Overheated adapter

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    Posted .
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    We were taking a long trip and my wife wanted to have her heating pad. When we plugged it in the adapter heated up

    No, I would not recommend this to a friend
    • Brand response from TechSupport
      Posted .

      Hello ThomasF, it is not advised to use a heating pad with this product, and that is an expected behavior. The inverter's maximum continuous power output is 140 watts, and heating pads can draw more power than that, potentially overloading the inverter and causing damage and overheating. CyberPower

  • Rated 1 out of 5 stars

    Portable car charger

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    Posted . Owned for 7 months when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    Work for a couple weeks, then broke like it was cheap plastic.

    No, I would not recommend this to a friend
    • Brand response from TechSupport
      Posted .

      Hi Keith, we appreciate your feedback. We’re sorry to hear the inverter didn’t hold up as expected. That’s not the quality we aim to deliver. Please reach out to CyberPower support for assistance. CyberPower

  • Rated 1 out of 5 stars

    Plug does not fit

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    Posted . Owned for 3 weeks when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    Does not fit plug. I tried 2 different types and neither would go in. This item Might be defective

    No, I would not recommend this to a friend
    • Brand response from TechSupport
      Posted .

      Hello MariaF, if you have not already, please try the device in a different vehicle, but if even then there are issues with connectivity, please reach out to us 1.877.297.6937 or online at https://www.cyberpowersystems.com/support/submit-a-support-ticket/ so we can troubleshoot and potentially explore warranty options if need be. CyberPower

  • Rated 1 out of 5 stars

    Not enough power

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    Posted . Owned for 3 weeks when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    Didn’t have enough power to charge my laptop. States 140w Laptop only needs 120w Other than the A Socket everything else works good

    No, I would not recommend this to a friend
    • Brand response from TechSupport
      Posted .

      Hello, it is not typically recommended that laptop chargers, or any high power inverters, that are close or even a bit less than the full power capacity of the inverter itself. That is because laptop inverters are expecting pure sinewave power to invert the power from AC to DC to charge your device. This car inverter outputs a simulated or stepped sinewave output and the laptop charger needs to work harder and pull more power from this device than it is able to handle. Because the process of converting your cars DC to AC with this travel adapter back to AC to DC with your laptop charger is highly inefficient, it is recommend you purchase a laptop charger meant for your laptop to have a DC to DC conversion. CyberPower

  • Rated 1 out of 5 stars

    Did not work

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    Posted . Owned for 3 weeks when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    Did not work when I bought it. Unable to return with in the 14 day window period and can not the company to refund me.

    No, I would not recommend this to a friend
    • Brand response from TechSupport
      Posted .

      Hello Evelyn, though we cant issue a refund, this device is covered by a two year manufacturer warranty so if there is trouble with it we should be able to resolve it and get a working one in your hands, feel free to reach out to us at 1.877.297.6937 so we can troubleshoot the issue with your equipment. CyberPower

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