Imagine holding a luminous beer mug in your hand, where the whole mug, and the beverage inside, spin with many colorful lights! This light-up beer mug is made of a high quality, safe, clear acrylic, with replaceable batteries The bottom cap which houses the electronics pops off for safe and easy cleaning of the mug. A great Gift Idea! These super-cool LED Beverage Cups make great gifts for any occasion or party goer and are great for that hard-to-shop-for party person. There are sensors in the mug, when liquid flows in the mug, light will glow and even if a single drop is left in the mug, light will remain. Bottoms up - buy yours today! Capacity-350ml 100% brand new High quality, please remember to dry the mug properly else light will not go off resulting in the drainage of battery.