Features: Arbitrarily issued 16 kinds of interesting analog sound. Control Mode: manual coding + external coding. Do it by yourself-. No professional qualification restrictions, very easily that every craftsman can use DIY fur to make a private custom "products" to for express themselves. 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. 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 for great value in this respect. It's much easier to assemble which is great for kids, begginers and hobbyist. Specifications: Material: plastic Size: approx 4.8x4.1cm/2x1.6in Working voltage: 4.5-5V Package Includes: 1x DIY Electronic note: Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item.