Octopus Single RGB Rainbow LED is one of the single rainbows LED electronic bricks in the Octopus series. The basic design is upon the OCTOPUS electronic bricks series with the identical design on the outlook, PCB fixed orifices, and the connectors of the electronic bricks. The on-board LED is a smart LED and an integration of a control circuit and light-emitting circuit, it can be operated under a low voltage with high luminance and large angle scattering.
Link: https://wiki.elecfreaks.com/en/microbit/sensor/octopus-sensors/output/octopus_ef04091