I know this device works fine because I use it to charge another USB gadget. However, my Flip Ultra HD doesn't like it all. It recognises that it's connected after a few seconds, charges for a few seconds, and then stops. I've tried other USB chargers with the Flip and they're all the same, the only way the Flip charges is connected directly to the computer which means having to take the computer out of sleep/hibernate mode, otherwise it stops charging then as well. From what I've read, some Flips can be temperamental like this whilst others work fine so I wouldn't discourage anyone from purchasing this for their Flip, just be prepared for possible disappointment. Flip really need to get their act together. Be advised also that this isn't an official Flip branded product - they do make their own mains charger but as far as I can tell it's only available in the USA.