Behind the ear is great when you still have reasonable hearing in a good chunk of the spectrum, so the dome from the BTE provides the boost that is additive to the natural signal.
Wireless earbuds' counterparts in the hearing aid world are called "in ear" or "in canal" or "completely in canal" or "hidden", and they provide some benefits, but do have a couple of drawbacks: they can often give the impression of a plugged ear because they keep the natural signal out (exacerbating tinnitus, which is common with hearing loss), and they can irritate the ear canal from all the friction (that part of our body is very sensitive). They can also prevent the natural outflow of cerumen (wax) and cause its accumulation.
Behind the ear is great when you still have reasonable hearing in a good chunk of the spectrum, so the dome from the BTE provides the boost that is additive to the natural signal.
Wireless earbuds' counterparts in the hearing aid world are called "in ear" or "in canal" or "completely in canal" or "hidden", and they provide some benefits, but do have a couple of drawbacks: they can often give the impression of a plugged ear because they keep the natural signal out (exacerbating tinnitus, which is common with hearing loss), and they can irritate the ear canal from all the friction (that part of our body is very sensitive). They can also prevent the natural outflow of cerumen (wax) and cause its accumulation.