Operation confirmed. Please understand that this item has been stored at home. Product Description Please note: This WiFi projector is small and best used in a dark environment. It is not recommended for large business meetings, presentations, or classes. It is weak in situations with a lot of white, such as Power Point, Word, and Excel. Adjust the focus wheel to properly focus the projector. If the projection is partially blurred and not clearly visible, you can improve it by doing this. The center is displayed slightly clearer than the surroundings. This is a characteristic of all home projectors. Please use the projector in a dark environment as much as possible. To use home projectors more effectively, we recommend using them in a dark environment, and adjusting the brightness and image quality during projector setup is also recommended. This projector does not have a built-in battery, so before turning it on, make sure to correctly plug in the specified power cord and operate it according to the instructions. If you prefer a battery-powered projector, we recommend the Crosstour Compact Projector S100. You can enjoy Amazon Prime Video, Netflix, Hulu, etc. via HDMI terminals using Fire TV Stick, Chromecast, etc.