When I plug my laptop into it, and then play music through my laptop I get really bad cyclical sound ... is there a way to filter this out?

I'm going with audio engineer dude on this one. But really what I wanted to address, is people saying it's due to it being a modified sine wave. That's not your issue. Laptops don't run on AC, they run DC, so first off sine type isn't an issue. Second, anything not straight off the main grid or a generator is a modified sine. There are better and worse, but if you're going DC to AC, it's modified sine. In all honesty though, if you're running a laptop off an inverter, the best thing would be to see if you can adapt straight from your original source to a laptop charger, bypassing the whole AC conversion.

The descriptions and photos here show TWO(2) AC Outlets, but some reviews say it only has ONE(1). Which is it?

The unit that I received has 2 110v outlets and 2 usb ports. The unit was used on a recent trip to Texas and worked flawlessly.

Will this drain the car battery and does the car need to be running to use this?

It depends. If you have an ICE car with an internal combustion engine and a small "starter/ignition" battery, you won't want to run anything more than a few hours, maybe less if your battery is older or you've run it to dead a couple of times already. But for my electric car, I've used a small inverter in the accessory jack to power small things for up to a week, and hardly noticed it.

Will this work with/charge a 15 inch Macbook Pro?

Yes it works very well, and runs quietly.

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BESTEK Dual 110V AC outlets and Dual USB 3.1A 300w power inverter car dc 12v to 110v ac inverter dc adapter laptop charger notebook adapter dc charger ac adapter usb charger MRI3011BU

BESTEK Dual 110V AC outlets and Dual USB 3.1A 300w power inverter car dc 12v to 110v ac inverter dc adapter laptop charger notebook adapter dc charger ac adapter usb charger MRI3011BU

Product ID: 740180014

Details

Brand
BESTEK
Model Name
MRI3011BU
Power Source
Corded
Voltage
12 Volts
Wattage
300 Watts

R2641

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Description

Introduction: Whether you are at home, on the road, or any remote location, you can trust BESTEK portable and backup power solutions, for the traveler on-the-go to keep your important d Review: Buena compra - Muy útil para cuándo sales de viaje con tu familia Review: Durable and effective. - If you wlare looking for a dependable addition to your vehicle to provide power to your laptop or other electronic devices, this is an excellent option. Well made, quiet, and stylish. Not too big or heavy either. I am quite happy that I purchased this device, it charges my laptop quite well and I can use rapid chargers for other devices like my phone. I also like that it has an on/off switch.

Specifications

ASIN	B004MDXS0U
Antenna Location	Vehicle
Brand	BESTEK
Brand Name	BESTEK
Country of Origin	USA
Customer Reviews	4.5 out of 5 stars 32,540 Reviews
Electrical Output Waveform	Pure Sine Wave
Frequency	60 Hz
Global Trade Identification Number	06950334926207
Input Voltage	110 Volts
Item Weight Unit of Measure	0.9 Pounds
Manufacturer	BESTEK GROUP LTD
Manufacturer Part Number	MRI3011BU
Model Name	MRI3011BU
Model Number	MRI3011BU
Output Power	300 Watts
Power Source	Corded Electric
Recommended Uses For Product	Vehicle
Voltage	12 Volts
Wattage	300 Watts

Reviews

L**A

Buena compra

Muy útil para cuándo sales de viaje con tu familia

18.07.2019

D**E

Durable and effective.

If you wlare looking for a dependable addition to your vehicle to provide power to your laptop or other electronic devices, this is an excellent option. Well made, quiet, and stylish. Not too big or heavy either. I am quite happy that I purchased this device, it charges my laptop quite well and I can use rapid chargers for other devices like my phone. I also like that it has an on/off switch.

22.04.2026

M**N

great value and good quality

honestly for me living in my car best ever ...It works great and lasted for a long time easy to use and connect to the ports ...five star for me ..

6.07.2026

K**L

Solid, quiet, reliable.

It's smaller than I expected! So far, it seems to work well with my small solar panel and battery array. I successfully used the A/C and USB ports simultaneously, and all went well! The cooling fan never came on, even though it is a hot day. I approve this product. So far.

8.06.2026

J**M

Excelente

recomendable y a tiempo en la entrega

7.02.2019

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R2641

Duties & taxes included

In stock

Sold byAmazon South AfricaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to South Africa.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Yusuf A.

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