Parameter: Output power:900W adjustable Input voltage: 110V,60HZ or 220V,50HZ Working Temperature:-20---65degree Storage temperature: -40 ? - +85 ? Harmonic wave output parameters ?97%?Min? Maximum operating current:10A Working frequency?20-40KHZ optional, please let us know the ultrasonic frequency you need after placing order ( You can also adjust the frequecny with the instruction of engineer according to your need).