Features: Universal Cap Fits Most Containers No drip automatic dispenser, the universal cap for most containers (half a gallon and up). Fits For 38/400 (38-400) – 38 mm neck diameter, 400 thread type For most bottles and jugs, runs, mouth diameter 1”(2.5CM,),1.37” (3.5CM),1.77”(4.5CM Electric Tap The Automatic Drink Dispenser needs a 2 “AA” Battery operated (not included). It has a battery-powered motor to draw drinks up through the straw and out of the dispenser. The tap turns any beverage container into an easy-to-use drink dispenser that eliminates the need to lift heavy bottles. No Drips No Spills It prevents spills, drips, and waste. No pouring from heavy, unwieldy bottles. You just need to pull the trigger near the water outlet to make it work and get the bottle of drink or beer for you. Especially convenient for children and the elderly. High quality material The material used in an automatic water dispenser is ABS+PP+ silica gel, safe and non-toxic, and can be used for a long time. Please note that slight colour differences should be acceptable due to the light and screen.