Piezo Electronic Buzzer SFM 20B DC 3V to 24V Alarm 95dB Continuous tone
£2.40
It has a resonant frequency of 3.9kHz +/-500Hz and can withstand temperatures ranging from -20 °C to 60 °C. Ideal for use in semiconductors and actives, this buzzer is a must-have for anyone in need of a durable and efficient warning device.