500ml Water Tank Large capacity and high performance provides up to 16 hours of continuous mist output, ideal for reducing stress, promoting sleep, and improving focus with various essential oils. Suitable for use in the bedroom, office, spa, yoga studio, and other environments. Quiet Operation Utilizes ultrasonic technology to ensure silent diffusion, making it perfect for home or workplace settings. Automatic Shut-Off Features water shortage protection that automatically powers off the unit when water levels are low for safe operation. Color-Changing Light Equipped with 7 LED colors, each with 2 brightness levels. Choose your preferred lighting mode to serve as a soothing night light or ambient illumination in low-light environments. Built-in Bluetooth Speaker Includes an integrated Bluetooth speaker. Pair your device with "KCL-Bluetooth" or "BT-Bluetooth" to stream music wirelessly and enhance your aromatherapy experience.