Description : Cross LED Dot Matrix Display Circuit Board Rotating Electronic Kit Respectively control 16 red LED and 16 green LED microcontroller 32 IO port; an infrared transmitting tube， an infrared receiving tube， an infrared receiving plate on the tube rotates a circle. Let microcontroller know playing characters or images from which point start; Wireless power supply to the board through the coil. Package included : 1 x Cross LED dot matrix display kit