PNBB Set Of Six 7 Ounces Automatic LED drinkware Control Type: Automatic Water activated; Lights up when pouring water in it. Eye catching LEDs: Auto color fading + flashing. Water activated: It glows automatically when drinks are added It turns off when there is no liquid left. Perfect for drink competition, see who is the first to finish the drink and turn off the LED. Guaranteed to build moods for your party; Perfect decoration for your party, bars and discos.