Piezo buzzers are used for making beeps, tones and alerts. This one is petite but loud! Drive it with a 3-30V peak-to-peak square wave. To use, connect one pin to ground (either one) and the other pin to a square wave out from a timer or microcontroller. For the loudest tones, stay around 4 KHz, but works quite well from 2KHz to 10KHz. For extra loudness, you can connect both pins to a microcontroller and swap which pin is high or low ('differential drive') for double the volume. Datasheet available here. Specification * Diameter: 11.90mm/0.47in * Height: 6.53mm/0.26in * Weight: 0.70g/0.02oz https://elecena.pl/product/22711322/piezo-buzzer-ps1240 2023-03-06 https://elecena.pl/product/22711322/piezo-buzzer-ps1240 2023-12-27 https://elecena.pl/product/22711322/piezo-buzzer-ps1240 2024-09-19 https://elecena.pl/product/22711322/piezo-buzzer-ps1240 2024-11-29 https://elecena.pl/product/22711322/piezo-buzzer-ps1240 2024-11-30 https://elecena.pl/product/22711322/piezo-buzzer-ps1240 2025-11-28 https://elecena.pl/product/22711322/piezo-buzzer-ps1240 2025-11-29