Use caution: 1. This is a diffuser, no need for any cotton swabs, you can add non- oils to diffuse the . 2. make to use a 5V2A adapter for power supply, otherwise the circuit may be damaged. 3. make that the water level is the , do not let the water enter the ventilation duct, otherwise it may damage the circuit. 4. It is recommended to add oils. do not add perfume and cologne. Description: 250ml - Color (Single) Colour:Black :plastic Size: 18 x 12.3cm Package Contents: 1 x Diffuser 1 x USB Cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.