PK-21H28P. Component family: Piezo transmitter (buzzer) with built-in oscillator. External thickness [mm]: 21.7mm. Manufacturer's product group: PK. Max temperature: +65°C.. Outside diameter [mm]: 26mm. Resonance frequency: 2.8kHz. RoHS: yes. Sound pressure [dB @ mm]: 96dB @ 2 feet. Type of circuits: piezo. [V]: +12V. Original product from manufacturer: Hitpoint. Quantity in stock updated on 12/11/2025, 21:08