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After persistently seeing this voguish Flip Ultra device around the vast vaping community, I decided to finally purchase one, and today I want to share everything I discovered while using this contemporary Key FOB style battery from O2 VAPE. The company itself is renowned for its many vaping wonders, so it’s no surprise they are the ones to introduce this patented upgrade to the most advanced 510 key fob vape pen. There are imitators out there, which I have extensively sampled, but the Flip Ultra is special and I will enumerate all the reasons why, from the device statistics to my direct user experience.