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There is a Legacy version here.

PFS StandardBrass EarItem 0

Source Player Core pg. 287 2.0
Price 1 gp
Hands 1; Bulk
A brass ear is a short, flared tube with one end narrow enough to comfortably fit against the ear canal. When using it to listen through a door, window, thin wall, or similar barrier, if the barrier would normally increase the DC of your Perception check to hear sounds on the other side, the DC increases by only half as much as normal. It's not suitable for improving your hearing in general, a role better served by a hearing aids.