Handy Beer Server Please use 2 AAA batteries. Compatible with 250ml, 330ml, 350ml, and 500ml cans. Can be used with a wide variety of sizes. Creates creamy foam even with canned beer. You can also add just the foam. Enjoy and liven up gatherings, parties, and camping during the New Year holidays! The ultrasonic part can be washed. Used only twice. No box.