Light -Emitting Diode." An LED is an electronic device that emits light when an electrical current is passed through it. Some examples include street lights , the red lights on cars, and various types of decorative lighting Features: installation diameter :16mm operation : indicator, With Buzzer lampshade color : Red; led Voltage :12V DC;24V DC; 110V AC;220V AC; Package Includes: 1 x  Buzzer with Red LED Light AD16-16SM ACDC220V