Bell, Round Vibrating Gong; 24 Vac; 0.32 Ampere; Sound Intensity 81 to 90 DB At 10 FT; 4 Inch Dia Gong Size; Steel Gong; Cast Aluminum Housing; Dawn Mist; Size 4-1/16 Inch W X 2-7/8 Inch D X 4-1/16 Inch H; Application Indoor/Outdoor; Approval Ul, Cul