security store 6 inch Automatic gong bell

6 inch bell . Ideal For School, Factories, Cinema Halls And Industries Warehouses,Avalable In 150 Mm ( 6" ) Gong. It gives a loud ring for big schools and factories. It works with 220V AC Current. Can be Connected to Electronic Timer such as Automatic school bell and Automatic industrial bell. Stand Alone Gong Bell for School, Factories etc.