Built-in battery for extended use,1800mAh large-capacity battery, up to 5 hours of battery life. the power cord and let the accompany you in any scene Professional sound cavity design, immersive,It can not natural sound effects, but also be used as a Bluetooth speaker with lower power consumption, fast connection and stable transmission Three-speed timer shutdown for peace of mind and focus,Short the "Timer Off Key" to select three levels of off time. Set it before going to bed and it automatically shut down after falling asleep Breathe warm light and relax the atmosphere,Breathing light effect, find inner peace between each inhalation and exhalation, and the light brightness can still be adjusted in multiple levels when the device is turned off 8 Types of Sleep Sounds,The sound machine includes sounds such as rain, bird chirping, ocean waves, stream, campfire, train, crickets, and church bells (Non looping!). Each sound has a soothing track and volume control, allowing for 255 combinations. Additionally, the sleep sound machine creates a personalized sleep, relaxation, or calming experience for both adults and children