This is the illumitrack, a handmade 3D avatar hand tracking device sold at the BOOTH "Kirisame Kobo." https://booth.pm/ja/items/6493085 *Currently, it is not compatible with SteamVR, so it cannot be used in VRChat. Please note that it can only be used with 3D tracking tools such as warudo. This device uses light sensors to track the opening of fingers. Due to voltage considerations, the use of 1.2V rechargeable batteries is recommended. Also, free dedicated software is required for tracking (available for download from the BOOTH sales page above). I tested it for about an hour. It's working without any problems. It comes with REBOCAP and mocopi mounts. It will be handed over as is; please reset the settings yourself. Support is available on the dedicated Discord.