If you are looking for a professional and mini light bulb, then your research is over here. That's because our product can satisfy your need. It makes easier to use in physical electricity experiment. It will be the good choice for you. Features - - Material: Glass. - Size: 2.50X1.50X1.50 cm/ 0.98X0.59X0.59 inch. - Rated voltage: 3.8V. - Rated Current: 0.3A. - Rated Power: 1.14W. - They are mainly used in electrical experiments of middle and primary school. - Great instrument for learning physical and electrical experiments, as well as the science DIY equipment for children and primary school students. - Can be equipped with , battery box, lead wire etc. to build small lighting circuit. - It is lightweight for carrying easily, which the students can bring it outside to play with their friends. - It is manufactured with professional technology to ensure the of the product and can work for a long time. Package list: bulbs