The Water Wave Projector creates a soothing atmosphere for sleeping, bathing or just relaxing! Sit back and enjoy the show...if you can keep your eyes open! The dynamic waves on the ceiling create a perfect ocean wave atmosphere for relaxing, sleeping, or bathing Automatically shuts down after one hour. Relax yourself before sleeping or help your children sleep Battery powered or USB powered. That offers greater mobility and flexibility with a built-in Mini speaker (mobile phone, mp3, or computer can also be used)