Two Power Supply Modes: The handheld nebulizer can be directly connected to a USB device (such as a laptop, power bank, USB card, etc.) or installed with 2 AA batteries. Powered by 2 AA batteries or a USB cable to operate the nebulizer. One-touch operation, simply press a button and the nebulizer can be safely turned on. The handheld nebulizer can naturally penetrate the body through your breathing, making it highly effective to use. Remember to disinfect all accessories after use to ensure cleanliness. The tilted liquid cup design reduces liquid residue, allowing you to enjoy the benefits of this nebulizer whether you are sitting or lying down. Cleaning Steps: 1. Press the button on the back of the nebulizer and remove the liquid cup. 2. Pour tap water into the liquid cup (do not exceed the maximum mark), then reinstall and secure it. 3. After starting up and removing the blockage, it can work normally.