Non-mist humidification method ensures the air is moisturized without creating any mist, making it perfect for use in small spaces. Low noise level of less than 36db allows you to work or sleep without disturbance. USB-powered for convenient use in your car, office, or home. Pack of 10 replacement filters provides a spare on hand in case of wear and tear. Proper sizes: each humidifier wick measures approx. 8 mm/ 0.3 inch in diameter, 100 mm in length. Filter replacement: replace after using for 3 - 4 months according to usage and water quality. How to use: cut the humidifier stick to the right size, then put into the humidifier directly, or soak the replacement stick fully in water before applying into the humidifier for better filtering performance. Made of quality material with good water absorption, allowing you to enjoy a nice condition and bring you a good mood. What you get: 10 pieces of humidifier replacement sticks in total, sufficient quantity for you and your families to replacement, providing a long time using experience.