With this kit, children and adults can become familiar with soldering, reading construction drawings and building a detailed model. Works with a 3 V CR2030 / CR2032 battery, which is not included. Ideal for STEM education. Features https://elecena.pl/product/18624414/arx-xm1u-mini-christmas-tree-kit 2021-05-30 https://elecena.pl/product/18624414/arx-xm1u-mini-christmas-tree-kit 2022-10-22