Used only once. Please note that there is no box. [Includes 19 kinds of soothing sounds] Six types of natural sounds are available for sleep and relaxation, such as birdsong, insect chirping, rain sounds, summer rain and thunder, the murmur of a river, and the sound of the sea. Sounds for babies (sounds of the mother's womb, "susu" sounds, and 6 lullabies) are included, and there are also 5 white noise and fan sounds that are effective for improving sleep and concentration. Not only does it work great as a baby sleep aid toy, but it can also create various atmospheres at home, helping to improve sleep, increase concentration, counter noise, and relieve tinnitus. [Built-in battery for peace of mind when going out] The 88g noise machine takes up little space whether you hang it on a stroller or put it in a suitcase, making it easy to carry. With a built-in 800mAh large-capacity battery, you can enjoy long trips and visits with your baby without worrying about running out of battery. [360° rotatable silicone strap] Comes with a strap, easy to attach and hang on a stroller, crib, or desk side, saving space. Based on the requests of parents, the strap is designed to rotate 360°, allowing you to change the direction of the sound simply by rotating it without having to untie the strap. [Sleep timer & memory function] Equipped with a sleep timer function, you can press the timer button to set the automatic off time to 30 minutes, 60 minutes, or 90 minutes according to your needs. The power will automatically turn off when the time is up, so there is no need to manually turn off the switch. It automatically keeps the previously set BGM, volume, and off timer, so you can immediately use the familiar settings when using it as a sleep aid or concentration aid. [Eye-friendly night light] Supports children who are not good at the dark with gentle light. Equipped with a warm-colored night light, it creates a warm and gentle sleeping atmosphere. It can be placed on the bedside as a bedside light, as well as used as a nursing light for changing diapers and preventing tripping and falling at night.