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 4.2A Dual USB Car Adapter and 110V AC Car Inverter 300W to Power Inverter DC 12V Power Converter Red

BESTEK 4.2A Dual USB Car Adapter and 110V AC Car Inverter 300W to Power Inverter DC 12V Power Converter Red

Product ID: 740180015

Details

Brand
BESTEK
Model Name
MRI3011BU
Power Source
DC
Recommended Uses For Product
Vehicle
Wattage
300 W

⚡300W continuous power output

🔌2 AC outlets + 2 USB ports

🛡️Durable metal housing & smart cooling

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$102.24

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Description

🔋 Stay powered, stay unstoppable — never miss a beat on the road!

BUILT TO LAST - Rugged metal casing with smart cooling fan ensures quiet, reliable operation even under heavy load.
DUAL CHARGING HUB - Two 110V AC outlets plus dual 4.2A USB ports for simultaneous rapid charging of multiple devices.
COMPACT PORTABLE - Lightweight 408g design fits easily in your car’s glove box or trunk—power wherever you roam.
POWER YOUR JOURNEY - 300W continuous and 700W peak power to keep laptops, tablets, and car accessories fully charged on the go.
TRUSTED AMERICAN BRAND - BESTEK’s proven reliability with an 18-month warranty keeps you confidently connected on every trip.

The BESTEK 300W Dual USB Car Adapter and 110V AC Power Inverter is a compact, durable power solution designed for professionals on the move. It delivers continuous 300 watts and 700 watts peak power through two AC outlets and two USB ports, enabling rapid charging of laptops, tablets, and other devices. Its rugged metal housing and smart cooling fan ensure quiet, reliable performance, while its lightweight design fits conveniently in any vehicle. Backed by an 18-month warranty, this American brand inverter is perfect for millennial managers who demand seamless power access during travel or remote work.

Specifications

ASIN	B004MDXS0U
Amazon Bestseller	#1,048,386 in Automotive ( See Top 100 in Automotive ) #1,616 in Power Inverters
Antenna Location	Vehicle
Brand	BESTEK
Built-In Media	1 x 300W Power Inverter1 x User Manual
Color	red
Customer Reviews	4.5 4.5 out of 5 stars (32,373)
Frequency	60 Hz
Global Trade Identification Number	06950334926207
Input Voltage	12 Volts
Item Dimensions L x W x H	12.2L x 7.9W x 4.8H cm
Item Weight	0.9 Pounds
Mfr Part Number	MRI3011BU
Model Name	MRI3011BU
Model Number	MRI3011BU
Number of Outlets	2
Output Power	700 Watts
Output Voltage	12 Volts
Power Source	DC
Unit Count	1.0 Count
Voltage	12 Volts
Wattage	300 W

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