Headphone Jack & Wide Use-Designed with a 3.5mm headphone jack,this portable sound machine enables you to enjoy the soothing sounds without disturbing others while sleeping,relaxing or working. With decent sounds, this noise machine can serve as a natural sleep aid to smooth baby, reduce tinnitus, respite from noisy snorers or help light sleeper,sleep disordered babies/kids/elders to fall asleep easier. Also a fancy choice to suit different environment for everyone.Auto-off Timer & Memory Function-This sound machine baby can be set to play continuously or automatically turn off after 30/60/120 minutes. Choose the suitable timer according to your different needs such as for a nap or night sleep or focusing during work. With memory function, it will remember the last noise you were playing so you don't have to scroll through the sounds to find your favorite. Simple to figure out for kids and elders with all the buttons on top.Sound Machine with Bluetooth Speaker-Designed with Bluetooth 5.0, this sound machine can connect with your smartphone fastly and stably. Wirelessly paired with your mobile phone or PC and choose your favorite white noise sounds, nature sounds, any style of music or audio books from the unlimited network. Enjoy the clear stereo sounds and get relaxed.15 Soothing Sounds & 8-level Volume-Built-in 15 high quality non-looping sounds: 4 fan sounds, 3 white noise, 1 lullaby and 7 nature sounds. With dual speakers on the canvas front of the machine, the sound is super clear. Just cycle through the intuitive buttons to find your favorite one. The volume of this white noise machine is 8 levels adjustable. Neither too loud nor too quite to block out most other noises, which is especially great for those kids that need white noise to fall asleep.Long-Lasting Battery Powered Noise Machine-Equipped with a 3000mAh rechargeable battery, our upgraded white noise sound machine provides up to 40 hours(under white noise mode, level 4 volume) playtime when fully charged by the included USB-C power cable. No longer need to be near an outlet or change batteries constantly. With lightweight and compact size, this portable sound machine for sleep is a good companion for travel.