1.10 types of soothing soundsThis white sound contains 10 unique, sweet and natural sounds, including nature sounds and lullabies for borns. You can choose the sound you prefer to yourself from your hectic work routine and effectively relieve anxiety, tension and irritability. (Note: hold down the previous song button to decrease the volume while holding down the next song button, increase the volume.) 2.Timing mode: The white noise machine for children can play continuously, and you can also set an automatic timer of 15/30/60 minutes so as not to forget to turn it off when you fall asleep. It has a timer memory function. When you turn on the machine again, it automatically s to the previous setting. 3.Safe mode: Press and hold the automatic button until the white light is on, and the monitoring function is activated. Once a 's cry is detected, the device will automatically turn on, then the music starts and turns off after 15 minutes. The detection distance is 6 to 10 metres. 4.Long battery life: This portable white noise machine for children is quickly charged via USB and has a longlasting battery that can operate continuously for 20 hours with a full charge in just 1 hour.