Step Up Voltage Converter Qutaway USB 5V to 9V or 12V Step Up Cable Adjustable DC to Dc Transformer Converter with Switch (5V-9/12V)

This product is made very well. I'm sure it would work for the devices it fits. Sadly the first one I received did not come with the 4 included barrel connectors. The company quickly sent me another unit with the connectors, only for the connectors to not be the same as pictured. I needed the tiny yellow connector and none of the ones they sent were small enough. I can use them for other things I have, but will not work for what I specifically bought them for. Not the fault of the product. It is a well made and sturdy product that does it's job well.

Got this to try to run my portable 7" dvd player off a usb battery pack. It does indeed do that comfortably as it only draws 7 watts. If your device draws under 10 watts this will work. Also the universal tips are the same as the ones I got with my usb to barrel cable here on amazon. so you can probably use other tips if the included ones don't fit.

Needs a 5.5mm x 2.1mm female to 4mm x 1.7mm male adapter to work with your DMW-DCC8 DC coupler for Panasonic Lumix G7. Unfortunately that adapter is not included in any of the available options, you have to buy it separately. https://www.amazon.com/gp/product/B06XPYC55S/ref=oh_aui_detailpage_o02_s00?ie=UTF8&psc=1

My application: Powering a Viltrox DC70 field monitor on a camera rig. Source power: PowerJunkie NPF power adaptor that powers my camera, the monitor and a mic preamp. This "works" my monitor powers on in 9v mode, and runs flawlessly. Unfortunately, this device introduces an electric "whine" into the audio based on where the small pack is placed. If I move the pack further away from the camera, the whine is minimal or disappears completely. At other times, the whine is audible. This would be perfect if it did not randomly mess with the audio.

Got tired of buying batteries for all my round-plug electronics, so I picked up one of these. With my 5v/2.1A USB battery I can now charge my mini guitar amp, a photo light and more. This cable comes with positive on the inside, but my mini guitar amp needed the positive on the outside sleeve, so I bought a reverse polarity cable and solved that issue very quickly. Read another review that says that same cable can power guitar pedals too! No more hunting for the right transformer!

DOA. Tried multiple inputs, USB bricks, power bricks. 11.96V out, no amps (mA or otherwise) out. Useless.

The switch does nothing. It did not work while other cords did

I bought this in an effort to standardize my power management systems...essentially everything I own can be charged via battery or usb port...except my zanflare c4 battery charger. This remedied that! No more using the bulky wall plug or having to bring a desperate car charger plug when I'm on the move. Now, like everything else, I can charge my batteries any where there's a standard usb port!