Type MYAU Alarm Annunciator Unit (hereinafter referred to as MYAU) is a visible and audible alarm device. It is mainly applicable to monitor the transformer operation status and fault. MYAU adopts Light Emitting Diode; it is reliable with more function and lower power consumption. The indication content on each channel lamp can be customized and changed. Working status and parameter can be displayed on LCD front panel. Setting method is simple, it is the newly updated product based on common alarm indication system.