Electronic Hooter With Led Indication. Technical Specifications: 1. Operating Voltage Range From 24V To 220V /- 30 Percent Ac/Dc (18 To 300V Ac/Dc). 2. Burden-Less Than 15 Ma At Nominal Output. 3. Audi Output-100 Db /- 5 Percent . 4. Panel Cut Out Size- 92 Mm X 92 Mm. 5. Mechanical Dimension- 96 Mm X 96 Mm X 60 Mm. 6. Weight- 230 Grams Approx Without Clamps. 7. Tone Selection- Three Different Selectable Tones/Adjustable. Wall Mounting Arrangement Should Be Provided With Suitable Bracket.