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An advanced artificial ear implant. A collection of invisible subdermal microphones capture sound and transmit it to a biogel nerve interface that links directly with the auditory nerve. It's sensitive enough to hear a cat before you see it, can't be damaged by loud noise, and automatically tunes itself to pick out meaningful sounds in noisy environments.
A Bionic ear is an ear replacement that has 125% efficiency, increases hearing by 12.5% per ear attached.
It can be purchased from traders or crafted for 10 and 3.