Avoid and do not waste your money - OTTO Engineering NoizeBarrier Micro

I have a very lightly used set that has ceased to fully function. Company does not stand behind the product. See below. They charge a lot of money for ear pro that they know does not last. See Otto response to my query about that were bought from this site on Jan 2022: Thank you for your email.
Based on the proof of purchase the earpieces are no longer under warranty.
The warrant is 18 months from date of purchase or date code on the earpieces.
The earpieces are not repairable, unfortunately.

Below is information we received from our QA department on product life on the earpieces.

It’s very hard to provide any kind of accurate life span expectation due to the variable use cases. The biggest variable seems to be body chemistry and function – some people’s body oils/sweat/etc attack the device, including the electronics, much more than others. Some people generate copious amount of cerumen but many do not. The there is the frequency and duration of use and the effect on the battery cycle life. Environmental factors may play a part – anecdotal evidence indicates that frequent usage in hot/humid environments may decrease the life span (or this may simply relate back to the sweat factor). Rough handling can certainly decrease life span.
Based on all of those variables the life span can be expected to vary between 1 to 5 years, with little ability to predict what an individual can expect.