6 SOOTHING SLEEP SOUNDS - The six white noise machine sounds include rain, brook, ocean (no seagulls), soft thunder, white noise, and summer night. This sleep sound machine baby soother helps not only babies but also adults to drift off to sleep faster and wake up feeling refreshed in the morning. MASK BACKGROUND NOISES - The white noise sound machine masks noise for improved sleep, concentration, and comfort. It blocks background noise while sleeping, working, or traveling to experience serenity in every situation. Relaxing sounds are also good for yoga, meditation, spas and more! OPTIONAL AUTO-OFF TIMER WHITE NOISE GENERATOR - Leave these soothing noise makers for sleeping all night or set a timer for 30, 60, or 120 minutes. PLUG IN OR USE BATTERY FOR NOISE MAKERS FOR SLEEPING - This battery sound machine is powered by an AC adapter (included) or 3 AA batteries (not included), making it an easy portable solution for travel. PORTABLE & COMPACT SLEEP MACHINE FOR ADULTS - The portable and compact design makes this sleek noise machine essential for home or travel.