Super long time for diffusion of the oil: can take over 48 hours to add water once the essential oil is diffused with the flowing water. The cold mist diffuser uses ultrasonic technology to create a soft environment by adding essential oils.Moisten the dry air a little and do not add too much moisture to the air: add ambience to your living room, office, bedroom or anywhere you need to add a relaxing touch. The flowing water can add negative ions and energy to the environment7 changing colours lights. The night light creates a relaxing and comfortable atmosphere that is good for sleep: the device cleans and humidifies the air, so you no longer suffer from dry skin and lips. The diffuser creates the perfect environment to breathe and sleep better, relax and feel better than ever! The product is made of BPA-free and food-safe material: we only use the same ultra-high-quality, safe and environmentally friendly PP materials, as well as the most advanced production technology and strict quality control. The BPA-free diffuser combined with the waterless automatic shut-off function automatically shuts off when water is consumed, making it safe overnight.Can work separately without connecting to the power supply: When the battery is fully charged, it can work for more than 15 hours. Our essential oil diffusers work alone without connecting to a power source. After the battery is fully charged, it can work for more than 15 hours and runs smoothly and silently, giving you a quiet and comfortable environment.