The package includes:
10 * 3.8V bulb.
1 *Battery box.
1 * Switch button.
2 * wires.
2 * Lamp holder.

Reminder: You need 2 AA batteries to carry out the experiments in this kit.
Kind note: the positive pole and the negative pole must not be directly connected, otherwise it may cause a short circuit!
Structure: The small ball is a tungsten bulb, made of glass, metal, and insulating materials. It can be used as a flashlight light source and indicator light of a distribution box.
Uses: Mainly used for electrical experiments.This product is an indispensable electrical consumable for elementary school science, middle school physics laboratory and student home laboratory.