If you connect this module with a power supply, a LED will light up which changes its colour automatically. It includes 7 different colours. 7 colour flashing LED module automatically uses 5mm round high-brightness light-emitting diode which has the following characteristics:
||3.3V to 5V
MAKE iT WORK Basic Instruction Kit
Check MAKE iT WORK KY-034 7 Colour LED Flash Module for basic instruction.