Review on 🔌 300Watt Pure Sine Wave Power Inverter for Cars - GISIAN 12V DC to 110V AC Car Adapter with LCD Display, Dual USB Ports, 2 AC Outlets - Ideal for Smartphones, Laptops, Tablets by Robert Castro

I bought a 300w device but it can't deliver 300w. Efficiency meter up to 50%, when I plug in another it goes to 115W beep and off after a few seconds. I mean it's not even half of what is advertised! I will return the device. Edit (9/4/2020): The seller contacted me by email, he is very polite, I explain the same in this review with some additional details. He said my device is most likely not working properly and returning it is the right course of action. So far it hasn't worked for me, but I like the seller's attitude and stumble upon a review that reflects my satisfaction from talking to polite and honest people. I consider myself simply unfortunate to receive a device that did not perform to specification. I will purchase another device and do more testing and then update my review again.