Lsgoodcare Blue LED Light Up Flashing Cola Cups Glass Ideal for party xmas bars clubs,Pack of 2 Eye catching LEDs: Auto color fading + flashing. Control Type: Automatic Water activated; Lights up when pouring water in it. Water activated: It glows automatically when drinks are added It turns off when there is no liquid left. Coin Battery included Guaranteed to build moods for your party; Perfect decoration for your party, bars and discos.