Thick Foam: The technology inside the Beer Foamer delivers ultrasonic vibration of 40,000/s to create a fine-grained and authentic thick foam, making your beer taste better. Handy Operation: Convenient to operate by fastening the Beer Foam Maker to the bottle. And you will get beer foam with a simple press and the machine will automatically power off after 20 seconds. Easy to Carry Around: The Beer Foam Machine is compact and portable. You can conveniently take it around to enjoy draft beer flavor anywhere and anytime. Clean with Ease: The Beer Server is reusable. The upper and lower parts can be moved up and down. The lower part can be cleaned but the upper part can not. Extensively Applicable: The Beer Foaming Machine supplies power by AAA batteries ( not included ), a practical gadget for beer bars, various parties, homes, etc. Applicable Model: The outer diameter of the bottle mouth is about 26.30.3mm The inner diameter of the bottle mouth is about 17.51.5mm Power supply: AAA alkaline batteries x 2 (not included) Product size: W42.4D42.4H94.5(mm) Product material: aluminum alloy, ABS, TPE, silicone Machine weight: about 88g Working voltage: DC3.0V Packing List: 1* Beer Fomer Notes: 1. Due to the lighting effects and shooting angles, there is a color difference in the product, please understand. 2. Due to manual measurement, there is a tolerance in the product size.