Step Up Converter,MICGOGO USB DC 5V to 9V Step-Up Power Transformer Cable with Barrel Jack Booster Module (5V-9V)

The media could not be loaded.  Although it wasn’t my intended use for this product, I ended up using it with a solar panel, USB power pack and a power adapter in order to charge my bluetooth speaker while on a camping trip.The USB power outputs 5v, but my speaker needs 12v power and although this outputs 2 amps and the speaker outputs 3 amps, I was still able to get a full charge on the speaker - so that was a real bonus!Very happy with this product! A great deal!

Nowhere near the power advertised. I reckon it fails at about an amp, but it works well otherwise. Very quite (electrical noise) for use with guitar pedals and other audio gear.

Use this in the little ones play house to power some 12v led strip lights from a USB power pack. Does a great job. Plug and play no adjustment required.

Really good item, wanted to be able to charge my portable dvd player with my 5v portable power pack.

Did work ask expecting

Works as described