Convenient, inexpensive, but just a little inverter.

I did the following tests:
I used the USB 5V with a gps: no problem
80w 230V UPS with a blender, it cuts out (except low speed).
I tested it with a laptop PSU empty: OK but I have not tried with a discharged computer
with a big enough radio: OK
Otherwise it is well finished, compact and with a security can be a little too sensitive and that hardly agrees peak current.
I advise the use of an electronic device that has no USB power supply and USB device with a gourmet alim.
It is cooled by a small bit noisy fan.
the price is that of a single power supply usb, but attention to the cigarette lighter which should be quite clear.