TMB12A03 3V Active Buzzer
TMB12A03 Active Buzzer [2.3KHz] beeps at a predefined frequency (2300 ±300 Hz) on its own even when you just apply steady DC power. You can still produce a sound from the buzzer connected to a microcontroller, such as an Arduino, by just driving a standard high output on the connected pin, so you don't need to use processing power, hardware timers, or additional code to produce sound.
Working voltage: 3VDC
Input voltage: 1.5 ～4VDC
Sound Pressure Level (SPL): 85dB (at 3V, 10Cm)