BESTEK 150W Power Inverter DC 12V to 110V AC Converter 4.2A Dual USB Car Adapter, Thinner Design with ETL Listed, Grey/Black

Been working on some old audio devices from the US and the standard step down was t quite cutting it. This is very handy as it outputs the correct voltage and frequency to ensure you're getting the right sound out of a nonUK device

The BESTEK 150W power inverter is great, compact and easy to use. I can plug in my laptop and charge my phone at the same time while driving. It doesn’t make much noise and doesn’t overheat. Perfect for road trips or working on the go. Definitely worth it!

My 13” laptop charges up fine, feels little slow but does the job. If not plugged in together with other devices. Works good with phone charging with fast charging but not along the laptop charger. Fan is pretty loud if put in a certain position. Find a angle or shake it to cur done the noise.

I purchased both this unit, the "BESTEK 150W Power Inverter DC 12V to 110V AC Converter 4.2A Dual USB Car Adapter, Thinner Design with ETL Listed, Grey/Black" (Model # MRI1511AU), and the "BESTEK 150W Power Inverter, DC 12V to 110V AC Car Inverter (Red Upgraded)" (Model # MRI1511L). I am posting this review on both product pages. Since the model names are identical apart from the letters at the end, I’ll refer to them that way. Short version: Although the specs are the same, and the prices nearly the same, this Dual USB "AU" version outperformed the “Red Upgraded” (“L”) version. (In addition, the “L” unit had something rattling loose inside on receipt.) More info: I plugged each unit, one at a time, into the 9v outlet in my car. I tested each unit by plugging in a small (20W) 2-speed motor, then switching it on low, high, off, high, low, etc. a few times each. Fan: - The fan was silent on this AU (box) unit; the fan apparently doesn’t kick in until cooling is needed. - The fan started immediately on the L (“red upgraded”) unit, gradually growing louder. It was, as other reviewers have noted, loud enough to be annoying in a quiet vehicle. Performance: - This “AU” box unit worked without difficulty: Running the motor was as seamless as when the same motor is plugged into an outlet. - The “L” unit worked … sort of. At first, the motor started up pretty much right away, switching from low speed to high without difficulty. But when I switched back to low speed, it stalled, recovering slowly. Same when I switched back to high speed. Then it worked fine again. Then it didn’t. I don’t know the cause, but it was as if the L unit was briefly overloaded when switching modes. Conclusion: - This “AU” unit gets five stars, at least for now: It works just fine, it’s simple, quiet, compact, and lightweight – just what I needed. - The “L” unit earns two stars: It works, sort of, but is inexplicably underpowered even though its specifications are the same as the “AU” unit.

Worked great for a few months before the internal fan started making a whirring noise louder than the car AC. Charges well but is basically unusable because of how loud and annoying it is.

Worked well during my 14 day, 5,000 mile car camping trip. I used to make coffee and heat up soup. Heated up faster than the literature sad to expect. I do recommend it.