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.