500ml Water Tank --- Large size and higher power up to 16 hours of nebulization, great for reducing stress, promoting sleep and improving work efficiency with different kinds of essential oils, whether in the bedroom, in the office, at the spa, at yoga or other occasions. Quiet --- thanks to the ultrasonic technology in particular, no disturbing noise, ideal for home use. Auto shut-off --- Water shortage protection design to ensure safety. The diffuser will turn off automatically when the water is not enough. Colorful Lamp --- It's with 7 kinds of color, each color has 2 levels. You can choose the light you like as a night light in the night or in a dark environment. Bluetooth Speaker --- This is a built-in Bluetooth speaker. Search the device name "KCL-Bluetooth" "BT-Bluetooth", connect with it, then you can enjoy.