Function as?Household Indicator Light,?when there is?DC?Current?(Nepa)Flashing RED LED indicator lights with Intermittent Buzzer, drove with AC/DC 12 VOLTIndustrial standard 22mm (7/8″) mounting diameterHight brightness and loud buzzer for easy recognition. Comes with a panel locking nut (Fits Panel Thickness: ?6mm)Screw-clamp connection provides firm contact for reliable operation. Tested over 30,000 hours of using time, they will surely offer a steady performanceWidely used in the ship, machine tools, machine equipment, switch cabinet and power distribution cabinet, electrical control panel such as HVAC Panel and electrical Panel, DIY Projects such as PLC Training ProjectThis range of pulsing indicator is perfect for use in alarm circuits. Flashing Light with interval beeping sound. Even better is the quick and easy installation with a back of panel lock nut and captive screw terminals. You are offered a voltage range of 12V AC/DC available in red and green. This range of LED indicators is rated IP30 and have an operational life of 30,000 hours.