19 Packs Hexagon LED Light Kits are designed for making various shapes with light effect to add fun Features sound-activated mode for changing the light color along with the music beat Each light block offers 16 million colors and 3 color modes including selected, dynamic and customized effects Comes with App Control allowing for adjusting brightness, setting dynamic effect, memory function and auto ON/OFF Features long life and low power consumption; CE, RoHS and FCC certified for safe use