The 4000 Hz centre frequency sits within the 2–5 kHz band where the human ear has greatest sensitivity, so alerts remain clearly audible even at modest drive levels. 3V ピークツーピークでは、保証される最小音圧は 10cm で 80dB であり、サンプル測定値は通常 83dB を超えます。 The capacitive nature of the piezoelectric element eliminates magnetic emissions, which is an advantage when the buzzer is placed near sensitive analogue or RF circuitry.