STEM project: Build a telegraph machine. Can you ship your mother and father an " you" message in Morse code? All-Inclusive: Our STEM kits include all of the vital materials, instruments for a profitable project. Learning Through Play: We want to , clean and pleasing for families to spend time building, exploring and growing together. Great Gifts: Spend 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 products aren't included. Note: Light and diverse exhibits could cause the color of the object within the photograph a little assorted from the genuine thing. The measurement allowed error is +/- 1-3cm.