Description: Product Name: LED Signal Light Buzzer Alarm Model: AD16-22SM Voltage: AC220V Power frequency withstand voltage: 2.5KW for AC, 1min Insulation resistance: more than 2 megohms Comparative Index: CTI greater than or equal to 100 Allow voltage fluctuations: Ue 48V or less when allowing fluctuations of plus or minus 5%; Ue greater than 48V when allowing fluctuations of plus or % Brightness: greater than or equal 75mcd Operating Temperature: -25 ~ + 55 Relative humidity: 98% Installation category: III level Pollution Level: 3 High brightness: greater than or equal 150mcd Specification: Material: Electronic component Height: 65mm/2.56 inch. Mounting Hole Diameter : 22mm / 0.87 inch Package Includes: 1 Piece Buzzer Alarm Note: Please allow 1-3cm (0.4-1.18) difference due to manual measurement and slight color variation for different display setting. Thank you for your understanding, nice day