'- Suttle loud indoor/outdoor bell- Modular bells and ringers are ideal for factories, farms, offices or any location where an audible signaling device is needed- Contains a modular jack that accepts line cords for plug-in installation and is available in single-line only- 45-130 VAC Ringing Voltage- 90dB- Mechanical ringer- Modular hook-up- Heavy duty- Two 4" bells- Ringer equivalency 1.0- 1 year manufacturer's warranty