Tatco 15300 Visitor Arrival/Departure Chime, Battery Operated, 2-3/4"W x 2"D x 4-1/4"H, Gray

PLEASANT "DING-DONG" SOUND ALERTS EMPLOYEES WHEN VISITORS ENTER OR EXIT. HIGH/LOW/OFF ADJUSTABLE VOLUME CONTROL. LIGHT-REACTIVE SENSOR HAS SENSING DISTANCE UP TO 15 FT. WALL MOUNTABLE WITH ANGLE-ADJUSTABLE MOUNTING BRACKET (INCLUDED). CAN BE USED WITH DOOR OPEN OR CLOSED.