Spies' Murmur

This earpiece, crafted from dark metal, is
worn curved around the ear. If you know a creature wearing another spies' murmur and that creature is within 1 mile of you, you can communicate telepathically with each other.
As a bonus action, you can allow that creature to hear everything you hear for 1 hour. You can end this effect as a bonus action, and it ends if you're incapacitated.
"AU!" - Dimir-Agent as his earpiece is knocked off his head