Features: -Material:Polystyrene -Security:Food safety -Drinkware Type:Mugs -Powered by:2*2025 button cells (included) -Flashing time: Around 28 hours -Color:4 colors flicker:Red, Green, Blue, Yellow change automatically -Capacity: 200ml-700ml -Weight:2.89oz -Mode: dynamic fast flashing, romantic slow flashing, all lights on. Package includes: -2*LED flashing cup Replace Batteries: 1.Unscrew the battery compartment door located at the bottom of base through cion. 2.Place new batteries in the battery compartment and screw on the battery door. Note: -It is not suitable for directly pouring boiling water above 80 degrees. High Quality and Environmental Friendly: Made of high quality and Food Grade Plastic Material, Safety and Durable Automatic on an off: Just add liquid to activate the flashing multicolored LEDs in the base of the cup. The lights turn off when the cups are empty. When activated, the LEDs flicker, change color and glow in a beautiful changing rhythm that is sure to delight. Durable Construction: Two long-lasting coin lithium batteries are included and installed in the bottom of the cup. The battery compartment is sealed with a twist on liquid resistant cap. Luminous cup: Flickering in the darkness with dreamlike feeling,Enjoy different drinking moment with this vivid shots Wide Applications: Best drinkware party favors or decoration for Christmas, New Years Eve, birthdays, weddings, shots, bars, night clubs or discos.