1. This is a diffuser, no need for any cotton swabs, you can add non-corrosive essential oils to diffuse the aroma. 2. Please make sure to use a 5V 2A adapter for power supply, otherwise the circuit may be damaged. 3. Please make sure that the water level is below the MAX line, please do not let the water enter the ventilation duct, otherwise it may damage the circuit. Specifications: ● Name: Aroma Diffuser ● Water tank capacity: 180ml ● Rated input: DC5V/2A ● Operating current: ≤900mA ● Rated power：≤4.5W ● Spray volume:15-20ml/h ● Product material: ABS/PP/electronic components Features: 1. Simulate flame lighting effects 2. 2.4MHZ ultrasonic frequency 3. No water and power failure protection 4. Electroplating button process 5. 2 levels of brightness adjustment 6. Aromatherapy essential oils can be added Package included: 1 * Diffuser 1 * Instructions for Use 1 * USB line Notes： 1.Please allow slight dimension difference due to different manual measurement. 2.Due to the different display and different light, the picture may not show the actual color of the item. Thanks for your understanding!