Electronic buzzer for 5 V operation. Ensure correct polarity!! Positive supply to the ‘-’ pin and ground to the ‘S’ pin! Data: Typical operating frequency 4000Hz at 80dB min, 5V DC at 5mA typical TMB12A05 or equivalent.
Tip to avoid mix up: The buzzer housing is slightly taller than the loudspeaker housing and has a label showing the + pin ident.