Hugmuu Baby Scale - Type: Baby Scale - Color: White - Functions: Power button, Unit switch button - Size: Oval - Product Name: Baby Scale Thank you for viewing! m(__)m After giving birth to twins, both were underweight and my breast milk production wasn't stabilizing, so I was concerned and purchased and used a baby scale from Rakuten. I have disposed of the box and instruction manual m(__)m I was able to use it without any difference from the one used at the hospital, so I think you can use it immediately even without the instruction manual☆ Thank you. m(__)m