Wide selection of sounds: 9 hypnotic sounds including white noise, ocean waves, crickets, rain, forest birds, streams and 3 lullabies Baby Sleep Pacifier: The white noise machine simulates sounds in the womb to create a peaceful sleep environment and allow your baby to sleep faster and more naturally. Auto-off timer: The auto-off timer can be set to 30, 60, 90 minutes to save energy, with a memory function to automatically play the music from the last shutdown. Breathing Light: Regularly blinking the light guides your breathing, inhale when the light is on and exhale when the light is off, breath control is a great way to fall asleep. PERFECT FOR TRAVELING: Small, lightweight, rechargeable lithium battery and USB power supply, it fits easily in a bag or suitcase, making it the perfect travel companion. Specifications : White Color Power supply: USB (included) Power: 3W Input: 5V/0.5-1.0A Battery : 1200mAh Rechargeable Li-Ion 18650 Usage time: 15-30 hours Charging time: 2 hours What's included in the package: 1 * Sounder, 1 * USB Cable, 1 * User Manual.