- Recording function: Mom can pre-record, and the baby will hear the mothers voice when she gets up.- Multiple uses: You can use it while you are studying or working to help you fall asleep, distracting or increasing your concentration.- Use the optional time to set to 15, 30 or 60 minutes. Then, the machine will automatically turn off after a set time, so you can loop in smoothly without waking up in the middle and then turning it off.- Not only for sleep: our white noise horn not only assists sleep, improves sleep quality, but also applies to the home, office, bedroom, nursery or any other place you want.- Adjustable volume: The white sound machine for sleep includes an adjustable volume control so you can get the sound correctly and set the perfect volume for your unique environment. The sound of the sleeping machine is low enough to calm a quiet, sleeping baby and loud enough to drown the annoying ambient noise.