KY-006 passive buzzer module uses an input signal to generate a tone, as a loudspeaker does, to be able to generate a tone pattern, or play a song, using an Arduino or other MCU to control it Frequency range: 2.5kHZ Working Current: <25mA Dimensions: 26mm x 15mm x 10mm (LxWxH including pins), 19 x 15 x 10 (PCB only)