isn't that earbud instead of iem?
yup, it is more like earpod style earbud. i just mention it in case someone is looking for open back design. in my personal experience, rather than choosing semi open to "no isolation“ iem, it is better to just pick earbuds, as they are generally sound fuller at the same/cheaper price.
except, of course, the ears can't accommodate earbuds, then semi open iems are the way to go