Please do use the measuring cup to add max 50 ml water 

Features: 

• Compact portable design for car use, nice shape and uniquestyle
• Generated ultra fine and smooth uniform aromatherapy mistin your driving
• No heat , no burning, 100% percent pure essential oils toretain active , enjoy natural aromatherapy feeling.
• Negative Ion generated helps to kill with germs
• Anti-corrosive water container material let you use preferredessential oil
• Powered by 5V USB,  you can connect to car charger(included), power bank or even computers

Product Specifications: 

• Product size: 60 mm (D) x 140 mm (H)
• Water capacity: 50 ml ( 2-3 hours continuous mist)
• Power: 5 W, 5V
• Color available: Silver,  Black