It's possible that "WEQTETJU" is a typo or a meaningless string of letters. To help me understand what you're looking for, please tell me:
* What kind of lighter are you referring to? (e.g., a Zippo, a disposable lighter, a torch lighter, etc.)
* Do you have any additional information about the lighter, such as its brand, model, or a picture?
* What specifically are you interested in learning about its design? (e.g., the fuel mechanism, the ignition system, the safety features, the overall aesthetics, etc.)
Once I have more information, I can give you a more informative and helpful response.