This is the Buffalo WMR-433W, an ultra-compact Wi-Fi router. It weighs only 19g. It's lighter than a single AA battery (approx. 23g). When staying at business hotels, the 2.4GHz Wi-Fi is often congested, which can result in slow speeds. This router allows you to use the less crowded 5GHz band, significantly reducing speed issues. Functionality has been confirmed, and the device has been cleaned with alcohol. A LAN cable is included as a bonus. This product includes: - Wi-Fi router unit - USB cable for power supply - LAN cable The manual is not included, but it can be downloaded from the following link: https://www.buffalo.jp/product/detail/wmr-433w-wh.html