Build your very own STEM Educational battery-operated Technical Tank. Building blocks compatible to Lego , simple motor, battery holder and step-by-step instructions with pictorial manual included in the box. Great way to introduce how things work to your child and fun as an activity for family bonding or for rainy days. Finished product size is 17cm length by 13.5 cm width by 12.5 cm height. Buy from Play N Learn, a reputable and leading educational toy store in Singapore.