This is an HDMI splitter made by Ippinkan. It has four inputs and two outputs, along with various audio settings. It includes a remote, though I’m not sure if it needs new batteries or simply doesn’t work. The buttons on the unit also require somewhat hard pushes to get them to work. It supports 4k 60Hz and HDR. I bought it in October of 2021.

Here is the name of the item as it appears in Japanese Amazon:

【HDMI認証取得品】hdmi マトリックス 4k 60Hz 4入力2出力 Ippinkan HDMIマトリックス セレクター hdmi 切替器 hdmi 分配器 hdmi2.0 hdcp2.2 hdmi 音声分離器(光デジタル・3.5mmステレオ音声出力) ARC対応 HDR/3D映像対応 Apple TV・STB・PS4・WiiU・Blu-rayなど対応 リモコン付き 日本語説明書　音声アップデート