16 Codings(ABCD): Arbitrarily issued 16 kinds of interesting analog sound. Control Mode: manual coding + external coding. Wide - Application: It can be assembled with toys and can produce as many as 16 different sounds making very interesting toys; Can also be converted into doorbell alarm clock alarm and so on. Manufacturered by WHDTS. Intelligence Development: An electronic product that allows you to assemble yourself. It can open your mind and imagination and can also train children and students. It is of great value in this respect. Easy Assembly. Supports Wholesale: The operating principle is provided as above picture shown and we provide electronic manual for you. It's much easier to assemble which is great for kids begginers and hobbyist. WHDTS has long been engaged in Electronics Related Products wholesale and retail business. Welcome letter to discuss the wholesale business. The bigger the amount is the more favorable the price is. DIY Electronics: Do it by yourself. No professional qualification restrictions very easily that every craftsman can use DIY fur to make a private custom "products" to express themselves.