Suns CB-4-24 Gray 24V Alarm Bell 4 Inch 24 Volt DC (4" in 24 VDC): Amazon.com: Industrial & Scientific
GONG ELEKTRYCZNY 24V
Horn 24V DC
10" FIRE ALARM BELL (GONG) 24 Volt DC, 98dB UL | eBay
Trio 8-24V 3 Tone Gong Honeywell Home 85dB - E2500 | Tameson.co.uk
Amazon.com: 90db High Decibel Fire Alarm Bell 24V Stainless Steel Internal Strike Type Electric Bell for Fire Alarm, Emergency Evacuation, School, Station : Home & Kitchen