Use caution: 1. This is a diffuser, no need for any cotton swabs, you can add non- essential oils to diffuse the aroma. 2. Please make sure to use a 5V2A adapter for power supply, otherwise the circuit may be damaged. 3. Please make sure that the water level is below the , please do not let the water enter the ventilation duct, otherwise it may damage the circuit. 4. It is recommended to add essential oils. Please do not add perfume and cologne.