I purchased this through crowdfunding to improve my sleep. It was different from the device I expected, so I haven't used it and have kept it in storage. By inserting it into the nasal cavity, it supports the securing of the airway and makes it easier to breathe through your nose during sleep. With a built-in fan, it's designed to gently send air through your nose, aiming to create an environment that makes breathing easier. It has a simple structure, just wear it and sleep, making it easy to use. Main unit x 1 USB cable x 1: USB Type-A ⇔ microUSB Type-B Supported voltage: 100-120V Battery capacity: 100mAh * Regarding the current (amperage) required for charging, it can be charged without any problems with a general 5V/1A USB output. Full charge time: Approximately 2 hours Continuous usage time: Approximately 3 hours It's designed with peace of mind, so you don't have to worry about it running continuously throughout the night, preventing overuse. It supports the beginning of sleep and the start of deep sleep, allowing you to use it efficiently and effectively.