Features:1. Suitable for family gatherings, business meetings, bars and other entertainment venues.2. Built-in 1800mah lithium battery, easy to carry.3. It can make the beer in the glass foam, making the party more atmosphere.4. Through the ultrasonic vibration, the beer will produce perfect foaming, making the beer taste better and aromatic residue.5. The chassis has a silicone pad to fix the bubbler and not spill beer.Specifications:Working principle: ultrasoundVibration frequency: 110KHZWorking voltage: 3.7VMaximum working current: 2ACharging current: 500maBattery capacity: 1800mahCharging time: 4HInstructions:1. Turn on the toggle switch2. Activate the tray and put half of water in it.3. Fill the cup with 60% of beer4. Press the ultrasonic touch button to generate foam, and the blue light flashes when working.5. The red light is on when charging, and the light is off when fully charged.Package List:1 * Beer Foamer1 * User Manual1 * Charging Cable Note:1. Must put half of the water in the tray, not beer2. Pay attention to water and beer, try not to splash the touch button, avoid triggering3. Must be cold beer4. This product is only valid for glasses