I know Astrotec other Earbuds will be Great, because those are even Higher end Astrotec True Wireless Earbuds. There is a hole there for it. After having them a while - the battery lasts for probably the better part of 16 hours, and they charge ridiculously fast. I think I tired everything I could think of. I got 6 years out of my first pair and hope that these 2 pairs will last 10+ years. So I was expecting it to be great ! perhaps 2mm goes inside And it provides this incredible seal so that virtually No outside noise can penetrate. ) BUT if it happens again for the third time then they will. they are completely plastic so I dont think they will last for years but at 40 bucks? I think I can afford to replace once they make it past the companys supposedly 2 yr warranty. Overall happy with the rack but did have scratches on the finish.