I've used these for about 5 to 10 hours, but they don't fit my ears well, so I can't use them for long periods. I'm using an iPhone 17, and there were no interruptions or issues. The second ear tip from the left has been used, and the others are unused. I've had a silicone case on them since I bought them. They are attached with double-sided tape, so I will ship them as is. If you only want the main unit, I will discount it by 300 yen.