Power: 2.0W<br> Power Supply: 3-5V DC<br> Input: AC 220V 50Hz<br> Working rate: >0.25ml/min<br> Noise at work: <20dB<br> Working frequency: 120KHz±10%<br> Power supply mode: Battery/Power cord<br> Battery: 2 x AA 1.5V (Batteries are not included)<br> Package Includes:<br> 1 x device (Do not include the charger plug)<br> 2 x masks<br> 1 x cup<br> 1 x USB cable <br> 1 x User manual<br>