ES-120     Ding Dong Door Chime
( DC 3V)

Designed around a CMOS sound effect chip , this kit produces the "ding dong" sound when you press the button switch on the pcb. The kit operates in the "one-shot" mode (auto stop after the ding-dong is repeated twice) which makes it suitable for use as door chime.  
Applications : door chimes, visitor chime (used with motion detector or proximity sensor),...

M8021-2 datasheet (pdf)