After pressing the button, the lights corresponding to numbers 0-9 will randomly at an interval of 0.5 seconds. Observe and the order of the lights. After all 10 lights are on, the device will timing. At this time, you can press the recorded lights. Press the corresponding buttons in sequence to turn off the lights.When all 10 lights are off, the answering is over, and the device will display the answering time and the number of answers. 1 point for each answer, for a of 10 points. The higher the score, the better the memory. Memory skills can also be exercised with frequent such tests.Material:plasticcolour:As shownPackage Contents:1 set * Memory tester setOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.