【Instant Purchase Available】 Brand new, unopened. No price reduction. Greenhouse Handy Beer Server for Canned Beer, Ultrasonic, Push-Button Switch, Blue GH-BEERIS-BL ● Handy beer server for use with canned beer ● 40,000 vibrations per second. Fine, creamy foam created by ultrasonic waves That creamy foam is created by ultrasonic waves. The frequency is important. After thorough verification, the vibration frequency was set to 40kHz. This means it vibrates at a speed of 40,000 times per second, too fast to see. ● Easily add more foam Instead of squeezing foam from existing beer, this method adds foam from new beer. You can easily add foam while maintaining the deliciousness of the beer under the foam. ● Easy to attach! Compatible with 250ml/350ml/500ml size cans ● Even more stylish, even easier to use ● Washable spout for hygiene ● Uses 2 AAA batteries *Not included ● Works with your favorite mugs and glasses, any glass is OK You can use it with any container, whether it's glass, metal, or ceramic.