Soles built-in LED lights,batteries need to be replaced. Pressure on switch under the heel part of insole,once kids jumps,lights flash on. Unique kid’s LED slippers, the children will have flashing lights every time they walk. It is made of high quality materials, soft hand feeling, no harm to the baby’s skin, no radiation.Light and flexible, support natural foot movement. The lovely lighting design has great attraction for your child, which is easy to generate interest and makes your child more cheerful and lively after putting on shoes. Don’t you think your children are doubly lovely when they bounce along beside you in their little shiny shoes?!