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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Power Inverter DC 12-17V to AC 110V - 300W Car Plug Adapter Outlet | 4.8A Dual USB Fast Charging Port, Vehicle Charger Cigarette Lighter Adapter for Phone, Laptop on Road Trip - Aluminum Housing

Product ID: 234777

Details

Brand
BESTEK
Model Name
MRI3011BU
Power Source
DC
Wattage
300 watts

⚡300W continuous power

🔌2 AC outlets + 2 USB ports

🛡️Multi-layer safety protection

$68.20

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Description

🔋 Power up your journey with BESTEK — never run out of juice on the road!

COMPACT YET RUGGED - iPhone-sized aluminum housing with aerospace-grade durability and silent smart cooling fan.
PEACE OF MIND WARRANTY - ETL certified with 5-year warranty and 24/7 customer support for worry-free power on the go.
POWER YOUR ROAD ADVENTURES - 300W continuous & 700W peak power to keep laptops, phones, and tablets charged anywhere.
DUAL AC FAST USB CHARGING - Two 110V AC outlets plus dual 4.8A USB ports for simultaneous fast charging of all your devices.
UNIVERSAL VEHICLE COMPATIBILITY - Works seamlessly with 11-17V vehicles including Tesla, SUVs, RVs, and sedans.

The BESTEK Power Inverter converts 12-17V DC from your vehicle into 110V AC power with 300W continuous output and 700W peak, featuring 2 AC outlets and 2 fast-charging USB ports. Its compact, aerospace aluminum design ensures durability and quiet operation, while multi-protection safeguards your devices. Compatible with a wide range of vehicles including Tesla, it comes with ETL certification and a 5-year warranty, making it the ultimate travel companion for professionals on the move.

Specifications

ASIN	B004MDXS0U
Antenna Location	Charge for phone, laptop, camera, etc; compatible with 11-17V vehicles like SUV, MPV, RV, Seadan, Trunk, Tesla
Best Sellers Rank	#193 in Automotive ( See Top 100 in Automotive ) #2 in Power Inverters
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 (33,908)
Electrical Output Waveform	Modified Sine Wave
Energy Specifications Met	UL, FCC, CE
Frequency	60 hertz
Global Trade Identification Number	06950334926207
Input Voltage	17 volts
Inverter Capacity Volt-Amp	25
Item Dimensions L x W x H	4.8"L x 3.1"W x 1.9"H
Item Type Name	Power Converter
Item Weight	14.4 ounces
Manufacturer	BESTEK
Mfr Part Number	MRI3011BU
Model Name	MRI3011BU
Model Number	MRI3011BU
Number of Outlets	4
Output Power	300 watts
Output Voltage	120
Peak Output Power Watts	700
Power Source	DC
Standby Power Shutoff	83.33%
Unit Count	1 Count
Voltage	12 volts
Warranty Description	18 Months
Wattage	300 watts

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$68.20

Duties & taxes included

In stock

Sold byAmazon USADelivered 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 USA.

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