HK522 - 3 KIND DOOR BELL SOUNDS
HK522 Features
* ＊Built 256 musical notes ROM memory with dual tone musical effect in IC body ＊3 independence song to be playing from 3 trigger pins ( TG1 , TG2 , TG3 ) ＊1 sequence trigger ( SQ pin ) for 3 songs output when SQ pin had sequence triggered Application Door bell , Door phone , Clock melody , Alarm syste
