It's a pocket Wi-Fi. You can share Wi-Fi with up to 7 devices when you're on the go. I was using it until recently. It was kept in a cover, so there are no major scratches. I've confirmed that it powers on, starts up, charges, and the buttons work. There is no battery swelling at all. Only the main unit is included, as shown in the images. Please check the condition in the images. Product Model Number: FS040W Reference Sites: https://fsi-plusf.jp/products/FS040W/ https://amzn.asia/d/94u8iTk Instruction Manual Site: https://fsi-plusf.jp/products/FS040W/img/download/FS040W_Mobile%20Router_UserGuide.pdf