6 SOOTHING SLEEP SOUNDS – The white noise machine sounds include Rain, Brook, Ocean, Thunder, White Noise, Summer Night. The sleep machine sounds help you 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. Blocks background noise while sleeping, working or traveling to experience serenity in every situation, OPTIONAL AUTO-OFF TIMER – Leave the sleep sound machine on all night or use the optional auto-off timer at 15, 30 or 60 minute intervals