Helm of Telepathy

Wondrous Item, uncommon (requires
attunement)
While wearing this helm, you can use an action
to cast the detect thoughts spell (save DC 13)
from it. As long as you maintain concentration
on the spell, you can use a bonus action to send a
telepathic message to a creature you are focused
on. It can reply--using a bonus action to do so -
while your focus on it continues.