Features: 1Accurately calibrated ultrasonic vibration it will enter beer invisibly thereby activating gas and creating bubbles. 2The beer bubbler is widely used in bars restaurants family gatherings festivals and carnivals. 3With this portable electric foam beer machine you can enjoy delicious beer anytime anywhere. 4Easy to use and carry the foam is soft and rich and will not affect the taste of beer and red wine. 5Support USB charging builtin 1800mAh polymer lithium battery suitable for glasses. Specification: Item Type: Beer Foam MakerMaterial: ABSCurrent: 2AVibration Frequency: 110KHzBattery: Polymer Lithium Battery 1800mAh (Included)Charging Time: 4 HoursWorking Times: 300 TimesApplicable Cup Recommendations:Glass cup and cup bottom thickness 15mm / 0.6inWeight: Approx. 193g / 6.8ozVibration Area Diameter: 8.7cm / 3.4inProduct Size: Approx. 12.4x12.3x3cm / 4.9x4.8x1.2inHow to Use:1. Turn the product over and turn on the toggle switch at the bottom of the product2. Add clean water to the water marking line in the tray and place the beer glass in the middle of the tray3. Fill the freezingbeer to 50% of the glass4. Long press the ultrasonic touch button to make the beer foam. When the foam has reached a certain level release the touch button and the blue light flashes when the product is working Package List: 1 x Beer Foamer1 x Manual1 x USB Cable Note: 1. Please allow 0‑1 inch error due to manual measurement. Thanks for your understanding.2. Monitors are not calibrated same item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.