Like all ingenious inventions, the sleeper is the most simple and reassuring solution. It is activated automatically, 4 seconds after the baby begins to cry, rocking the crib gently and smoothly. After 5 minuets it stops, remaining ready to be operated again. the sleeper is equipped with a selection dial, enabling you to choose the ticking intensity. Just adjust to baby's crib. An original invention, offering more comfort to parents & more calmness to baby.