Very easy to play, just repeat random color sequences of flashing lights by pressing the colored pads in the correct order. Memory training toys for children over 3 years old that enhances memory, patience, hand-eye coordination. or play with friends to beat the longest sequence of colors for correct repeating. With light and sound effects to improve playability. Made of premium ABS plastic, smooth and burr-free, great for kids. Size Chart: A: approx. 6x2.5x6cm/2.36x0.98x2.36inch B: approx. 7.8x2.5x7.8cm/3.07x0.98x3.07inch C: approx. 8.5x2.5x10.5cm/3.35x0.98x4.13inch Package Includes: 1 Piece Memory Training Toy Note: Colors might be different due to different monitor display. Manual measurement may cause slightly difference in size.