12MM with 42 Resistance

Small Piezo Buzzers Suitable for Arduino Electronic Projects

The 12085 passive buzzer is a tiny 12mm wide by 8.5mm tall magnetic/piezo transducer that requires an external alternating square wave or PWM signal (typically 2kHz to 5kHz) from a microcontroller like an Arduino to generate variable tones, musical notes, or multi-frequency alerts.

Dimensions: 12 mm diameter × 8.5 mm height
Operating Voltage: 3V to 12V DC
Resonant Frequency: 2048 Hz
Coil Resistance: Typically 16Ω or 42Ω depending on the exact sub-model variant
Sound Output: ~85 dB at 10 cm
Operating Current: ~30mA to 45mA