eye
noun [ C ]
uk/aɪ/ usbe the eyes and ears of sb/sth (also be sb's/sth's eyes and ears)
to help a person or organization by telling them about important events or changes that might affect their particular industry or activity:
Corporate brokers are supposed to act as a company's eyes and ears in the marketplace.
New security measures are calling on all airport and airline employees to become the "eyes and ears" of the airport and report all suspicious activity