AL-28SW09-DT. Component family: Piezo transmitter (buzzer) with built-in oscillator. External thickness [mm]: 20mm. Manufacturer's product group: AL. Max temperature: +60°C.. Outside diameter [mm]: 28mm. Resonance frequency: 2.9kHz. RoHS: yes. Sound pressure [dB @ mm]: 90dB/30 cm. Type of circuits: piezo. [V]: +11V. Original product from manufacturer: Ekulit. Quantity in stock updated on 13/11/2025, 14:54