Not disagreeing with
@borbjorbis but I just wanted to say that the vibration is honestly too subtle to be reliable for me personally. I've tried using my VM Click with headphones on, but the results were either paranoia or a wasted bowl.
However, I'm sure you could find a technique that would make it easier to pick up, especially if you learn the manual timing as a backup. And isn't it true that people who are blind or deaf often get enhancements to their other senses as a way for the brain to restore balance? Sorry if I'm making assumptions but maybe you wouldn't have any problems at all.
Or you could even ask
@David and Michael if they can make the vibration louder for you. I believe they mentioned in a Q&A that they trialed quite a few different clicks before settling on this one. And they come across as really empathetic people, so might be worth a shot. Their email is
info@nowinhale.com if you want to try that route.