Electronic Fire Bell

 CL-207 24VDC Electronic Fire Bell with Sweep Siren Tone Type
Key Specifications/Special Features:
  Input voltage: 24VDC (12VDC to 30VDC), with reverse polarity protection
  Operation current: only 22mA, 28mA max. at 24VDC
  Sound output: 100dB +/- 5dB at 24VDC
  Tone type: sweep siren
  Operation temperature: -10 to +60 degrees Celsius
  Continue operation test at 24VDC: over 72 hours
  Life test: on: 1 minute, off: 30 seconds
  Duty cycle at 24VDC: continuously over 500 hours period
  Size: 81.5 x 81.5 x 32mm (fit European junction box)