This is a long distance 2.4G wireless module which basic on nRF24L01+ chip, and there is the PA and LNA circuit on board, with the external antenna it can reach long distance than the one without these parts.
Digital RGB ring is an intelligent light source consist s of WS2812B RGB LED with Integrated Driver Chip. The control circuit and RGB chip are integrated in a package of 5050 components.
This LED ring is a full-color that external control for each lamp beads. It with high brightness, can achieve effects of full color running water, chasing and scan.
This laser pointer or laser pen is a small handheld device with a laser diode emitting a very narrow coherent low-powered laser beam of visible light, it is frequently used in lecture halls and demonstrations to point at topics of interest on a presentation board. In a school setting, they have become ubiquitous, and they are very useful teaching aids....