Check the listing for details. 5pcs AC/DC 24V Panel Indicator Flashing Light for HVAC Red LED Alarm with Buzzer. Condition: New. Listed at 14.99 USD. Indicator LightProduct Details1.High brightness and loud buzzer for easy recognition. Flame-resistant housing and high strength. Comes with a panel locking nut (Fits Panel Thickness: ≤6mm)2.Industrial standard 22mm (7/8") mounting diameter3.Flashing RED LED indicator lights with Intermittent Buzzer, drove with AC/DC 24 VOLT4.Screw-clamp connection provides firm contact for reliable operation. Simply drill hole, and use the included screw ring to secure this indicator light. Tested over 30,000 hours of using time, they will surely offer a steady performance5.Widely 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 Project.