All components clip together easily, so there is no soldering involved. Each piece has a function: switches, speakers, battery packs, lights, and more. They are all colour-coded and numbered to easily identify in the instruction manual. There are 80 electronics experiments that mini-Einsteins can do, including doorbells, alarms and flashing lights. The kit needs four AA batteries that are not included. Age guide: from 7-12 years.