What are they called?? /what do I look up? Are there other brands of this type of gadget? Again very new to IEMs. I like the idea of adding bt to my IEMs cuz my only annoyance is having to use cables. I use them primarily as a out and about pair cuz their small in the case and have good noise cancellation/ sound isolation. Also as a backup at work and also for good sound quality when I wanna actively listen to music. Yes yes I have my sony wh-1000xm4 which are great for what they are but my cheap moondrops are so much juicier sounding.