[Be your own sleep DJ] S11 white noise machine lets you mix 10 basesounds using sliding track buttons. Use your imagination to combine rain, fire noises, or othersounds to createcombinations.for sleep, focus, relaxation, yoga, noise cancelling, meditation and more[30sound options] S11 white noise sound machine has 10 level white noise, 10 level fan sounds, 10sounds like rainning,wave, thunder, lullabye and more. These 30 sounds can be combined at will to generate white noise/brown noise/pink noise/green noise[4 auto-off timers & adjustable 16 volumes] Theportable sound machine features 4 auto - off timers (30/60/90/120 minutes), making it easy for you to fall asleep. It has 16 volume levels, allowing for precise adjustments using the knob on the right side. Equipped with 2 high - quality built - in speakers, it delivers clear sound effects, creating an ideal sleep[2000 mAh built - in rechargeable& USB - C port] The sleep sound machine features USB-C charging and a built-in 2000mAh rechargeable battery, providing over 20 hours of playback on a single charge (around 8 hours at max volume). Enjoy worry-free travel without frequent recharging. (Notice: Theplug is not included.)[Switchablelight & 3.5mm headphone jack] The travel sound machine supports 3.5mm headphone jack, so you won't disturb others in the office or while traveling. Lights that follow your breath to calm down between exhalation and inhalation,for yoga, sleep or waking up at night. Notice:Long press the button next to the white noise machine to turn off thelight[What You Get] S11 white noise sound machine, USB-C cable, user manual and 18-months return and exchange service, please feel free to contactif there is any quality problem with the noise machine. Besides, the noise machine is FCC, CE and RoHS certified, so you don't need to worry about any accidents.