7-color RGB bluetooth Led hat with built-in matrix display board and battery, as a gift for students in fishing cap baseball cap
https://www.vogueparade.com/shopping/EN/4004/1/4001358629795/7-color-rgb-bluetooth-led-hat-with-built-in-matrix-display-board-and-battery-as-a-gift-for-students-in-fishing-cap-baseball-cap//