[How to use]You can place the sleep assist sound on your pillow and use the bone transmission vibration generator to automatically reduce the noise. It can clearly transmit sound to the ear nerves without wearing it, saying goodbye to earache caused by traditional headphones/sound. [Sleep Assistance] Release stress and help sleep. The white noise environment soothes the brain nerves, reduces the concentration of body operations, relaxes the brain's consciousness, and makes it easier for you to fall asleep. You Need to Press Your Pillow Against Pillow Speakers for Good Sound Quality, White Noise Machine for Adults to Sleep, Portable Sound Machine for Baby [Wireless Link] Bluetooth 5.1 low-power link, fast speed, no delay, using high-performance chips, stronger anti-interference. [Long-lasting Battery Life]Built-in 400mAh rechargeable battery, it only takes 40 minutes to fully charge and can provide 20 hours of continuous playback. [Timer Function Design] Just double-click the M button and it will automatically turn off in 30/60 minutes, freeing your hands and allowing you to sleep well all night long. (Please adjust the volume through your mobile phone)