New, unused. I'm selling it because I don't plan to use it. Here are the product details: 【All-Around Technological Innovation - Easy to Use and Convenient】 This is a mesh nebulizer with all-around technological innovation. It converts medication into an ultra-fine mist with a particle size of 4μm, allowing the active ingredients of the medication to be smoothly delivered through breathing from the trachea to the bronchi and alveoli, enhancing the effect in deeper areas. You can easily use it by simply putting the medication into the medication cup, without any complicated operations. Going to the hospital can be troublesome and time-consuming, and there is also the risk of cross-infection. You can easily perform nebulization at home, saving the trouble and time of going to the hospital, and it will not interfere with your busy daily life. 【Mesh Part Replacement Practical Utility Model Technology】 With the unique mesh part replacement technology, you can replace only the mesh cap, and the medication cup does not need to be replaced. This innovative design significantly reduces the cost of consumables and is also economical. With the included replacement mesh cap, if you suddenly can't nebulize, you can immediately replace it and continue nebulizing. You can quickly eliminate the anxiety of not being able to produce mist. It achieves both cost reduction and convenience. 【Automatic Cleaning Function - Effective Cleaning】 Equipped with an automatic cleaning function, it effectively avoids mesh clogging. After use, simply put distilled water into the medication cup and long-press the power button to automatically start the cleaning function, which easily removes the medication remaining on the mesh. It prevents clogging of the mesh cap and maintains clean and effective use for a long time. 【Digital Display - Multi-Function】 Equipped with the latest digital display and multi-function design, providing a more convenient and effective user experience. 【Quiet Design - Comfortable for the Whole Family】 Because it uses mesh-type ultrasonic technology, there is almost no operating noise. It does not cause anxiety for babies and young children, and can be used at night without worrying about the surroundings. You can use it with peace of mind even late at night without disturbing sleep. It comes with three types of inhalation accessories: an adult mask, a child's mask, and a mouthpiece, to meet various needs and can be used comfortably by the whole family. 【Lightweight and Compact - Excellent Portability】 The lightweight and compact design allows you to use it easily even when you are out and about. You don't have to worry about air tubes getting tangled or getting caught in places you can't reach like with a compressor type, and it's simple to use. It's convenient for travel and business trips, and it operates on two AA batteries even in situations where it's difficult to secure a power source.