--- product_id: 740180015 title: "BESTEK 4.2A Dual USB Car Adapter and 110V AC Car Inverter 300W to Power Inverter DC 12V Power Converter Red" brand: "bestek" price: "¥17726" currency: JPY in_stock: true reviews_count: 5 category: "Bestek" url: https://www.desertcart.jp/products/740180015-bestek-4-2a-dual-usb-car-adapter-and-110v-ac store_origin: JP region: Japan --- # 300W continuous power output 2 AC outlets + 2 USB ports Durable metal housing & smart cooling BESTEK 4.2A Dual USB Car Adapter and 110V AC Car Inverter 300W to Power Inverter DC 12V Power Converter Red **Brand:** bestek **Price:** ¥17726 **Availability:** ✅ In Stock ## Summary > 🔋 Stay powered, stay unstoppable — never miss a beat on the road! ## Quick Answers - **What is this?** BESTEK 4.2A Dual USB Car Adapter and 110V AC Car Inverter 300W to Power Inverter DC 12V Power Converter Red by bestek - **How much does it cost?** ¥17726 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/740180015-bestek-4-2a-dual-usb-car-adapter-and-110v-ac) ## Best For - bestek enthusiasts ## Why This Product - Trusted bestek brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **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. ## Overview 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. ## Description BESTEK 300W Power Inverter DC 12V-110V AC Car Inverter Review: Muy útil para cuándo sales de viaje con tu familia Review: I’ve been using this power inverter for almost ten years (desertcart says that I purchased it in 2017 and it’s not April 2026). The device has worked consistently and without any issues at all. I’ve always had it in my vehicle and it has always worked when I needed it. Powering my laptop, smart phone and anything else, it has always worked. Get it and keep it in your vehicle. ## Features - Bestek Advantage: A leading American power inverter brand. Provides 300 watts of continuous DC and 700 watts of instant power with two AC outlets and two USB ports - Rapid Charging: (0-2 4A) 2 110V AC outlets for charging larger devices such as USB compatible devices such as your car accessories, a good choice for power your laptop and tablet, 2 USB charging ports - 360 Degree Beach Wheels and Adjustable Handle: Heavy duty 7" x 4" thick rubber wheels. Folding wagon is 360. The cart wheels rotate at random, allowing the wagon to be adjusted to fit different road surfaces. The telescoping handle allows the wagon cart handle to adjust the height by pushing the cart to fit people of different heights, providing easy control on most terrain - EASY TO TRANSPORT: Set in seconds and no assembly required! Folds into a carrying bag for convenient storage Small enough to fit in the wall or in the trunk of any standard car in the closet. Folding Utility Wagon Cart is perfect and great for transporting shopping such as beach sand, garden, park, camping, outdoor sports events, family outings for travel to travel or product trolley, but or simply moving things - Durable metal housing provides high protection from drops and impacts. The car power inverter will be very quiet when the smart cooling fan is working, and it will run faster if the power exceeds 70 watts. 18 Month Warranty ## Technical Specifications | Specification | Value | |---------------|-------| | 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 | ## Product Details - **Brand:** BESTEK - **Model Name:** MRI3011BU - **Power Source:** DC - **Recommended Uses For Product:** Vehicle - **Wattage:** 300 W ## Images ![BESTEK 4.2A Dual USB Car Adapter and 110V AC Car Inverter 300W to Power Inverter DC 12V Power Converter Red - Image 1](https://m.media-amazon.com/images/I/81kurNCSh9L.jpg) ![BESTEK 4.2A Dual USB Car Adapter and 110V AC Car Inverter 300W to Power Inverter DC 12V Power Converter Red - Image 2](https://m.media-amazon.com/images/I/718U6bioS7L.jpg) ![BESTEK 4.2A Dual USB Car Adapter and 110V AC Car Inverter 300W to Power Inverter DC 12V Power Converter Red - Image 3](https://m.media-amazon.com/images/I/71zC0pYudOL.jpg) ![BESTEK 4.2A Dual USB Car Adapter and 110V AC Car Inverter 300W to Power Inverter DC 12V Power Converter Red - Image 4](https://m.media-amazon.com/images/I/81FduLk48vL.jpg) ![BESTEK 4.2A Dual USB Car Adapter and 110V AC Car Inverter 300W to Power Inverter DC 12V Power Converter Red - Image 5](https://m.media-amazon.com/images/I/71zbOLahUmL.jpg) ## Questions & Answers **Q: 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?** A: 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. **Q: The descriptions and photos here show TWO(2) AC Outlets, but some reviews say it only has ONE(1). Which is it?** A: 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. **Q: Will this drain the car battery and does the car need to be running to use this?** A: 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. **Q: Will this work with/charge a 15 inch Macbook Pro?** A: Yes it works very well, and runs quietly. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Review *by L***A on July 18, 2019* Muy útil para cuándo sales de viaje con tu familia ### ⭐⭐⭐⭐⭐ Review *by B***H on April 21, 2026* I’ve been using this power inverter for almost ten years (Amazon says that I purchased it in 2017 and it’s not April 2026). The device has worked consistently and without any issues at all. I’ve always had it in my vehicle and it has always worked when I needed it. Powering my laptop, smart phone and anything else, it has always worked. Get it and keep it in your vehicle. ### ⭐⭐⭐⭐⭐ Review *by D***E on April 22, 2026* 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. ## Frequently Bought Together - BESTEK 300W Power Inverter DC 12V to 110V AC Car Inverter with 4.2A Dual USB Car Adapter - Reliance Products Aqua-Tainer 7 Gallon Rigid Water Container, Blue , 11.3 Inch x 11.0 Inch x 15.3 Inch - DkOvn Solar Shower Bag, 1/2/4 Pack 5 Gallons/20L Camping Shower Bag, Portable Shower Bag with Removable Hose and On-Off Switchable Shower Head for Camping Beach Swimming Outdoor Traveling --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.jp/products/740180015-bestek-4-2a-dual-usb-car-adapter-and-110v-ac](https://www.desertcart.jp/products/740180015-bestek-4-2a-dual-usb-car-adapter-and-110v-ac) --- *Product available on Desertcart Japan* *Store origin: JP* *Last updated: 2026-05-21*