STEM project: Build a telegraph machine. Can you ship your dad and mom an " you" message in Morse code? All-Inclusive: Our STEM kits encompass all of the vital materials, devices for a ecocnomic project. Learning Through Play: We wish to , clean and gratifying for families to spend time building, exploring and establishing together. Great Gifts: Spend high quality tutorial time together! color:As shown Material:pcb Package Contents: 1 x stem kits(Not included 4 AA batteries batteries) Only the above package content, assorted merchandise aren't included. Note: Light and different exhibits can cause the color of the article in the photo just a little diverse from the real thing. The size allowed error is +/- 1-3cm.