Description: Product Description Specification: E10 bulb Nominal voltage: 3.8V Rated current: 0.3A Thread diameter: 9mm/0.35Inch Overall length: 24mm/0.94in E10 large bracket curved bow lamp holder Material: Copper. Height: 17mm/0.69'' Seat Diameter: 10mm/0.39'' Pin Length: 42mm/1.65'' Color: Silver. Packing list: 10PCS E10 bulb, 10PCS E10 bulb holder. Feature: This product is mainly used for electrical experiments in primary and secondary schools. This product is of high quality, bright and durable. It is a necessary electrical equipment for elementary school science, middle school physics laboratory, and student home laboratory. Notes: When using a small battery, please provide a voltage consistent with the rated voltage. If the working voltage is too high, it is easy to damage the electric beads. The operating voltage is too low and may not be able to emit light.