Clips to clothes, pram, baby carrier and bed rail. Soothing for the baby and me, makes outside noises less disturbing. The only drawback is that the speaker is not as powerful to create enough surround sound. Therefore when the baby sleeps at hone, we have to use our usual Bose speaker, as we have 2 other kids running around so too much noise to be cancelled out - Woosh cannot do that. Woosh works well in the pram when we are outside, as well as at night when it is quiet.