This is a 22mm round enclosed piezo element with mounting holes, you can use it as buzzer/speaker that operates around the audible range. You can use these speakers to create simple music or user interfaces. You can use these as sensor to detect fast movements and knocks.
Operating Voltage: 3V~24V
Rated Current: <30mA
Operating Temperature Range: -20°C to +60 °C
Storage Temperature Range: -30°C to +85 °C
Dimensions : 22mm diameter, 11.5mm tall