Single Line Loud Ringer and Door Chime. The SR-1 will generate loud ringing from an analog ringing line or from a dry contact closure. There are 4 different ringing sounds to choose from. Loudness is easily adjusted with a volume control knob and test button. The SR-1 s unique sounding ring is useful for employees that often work away from their desks, allowing them to instantly recognize when their phone is ringing. A second set of contact inputs will trigger a door chime (doorbell) sound. This can be used to notify that a door has opened or used as a door bell or push for assistance button. The SR-1 is easy to install and comes complete with a power supply and connections for an optional external speaker. Applications Single line loud ringing Night bell ringing Business/offices/small warehouses Floating employee Push Button for Assistance chime Push button doorbell Features Loud ringing from an analog line Loud ringing from a dry contact closure Choose one of four ringing sounds: - Electronic warble (traditional loud ringer) - Double gong (two identical gong tones) - Quadruple chime (four descending chime tones) - Electronic Bell Adjustable volume control Provides a door chime tone for either a door bell, door open sensor or Push for Assistance button Test button for setting volume Power supply included Test button for setting volume 1 year warranty Made in the USA.