This is the hub unit built into the SwitchBot Ceiling Light Pro (for 8 tatami mats). By replacing the ceiling light's Wi-Fi unit with this, it can also be used as a hub. This allows you to control infrared remote control devices in the room from a remote location. Unlike other hubs, it's convenient because it draws power from the ceiling. (The black component on the upper left side of the board, which is not the base, is the infrared unit, and this component is not present in the ceiling light. The other parts are mostly the same, so you just need to disassemble and replace them.) ※There seem to be two types of 8-tatami mat models, and this one was included in the older model (cover diameter of 48cm). It is unknown whether this will fit the newer model (cover diameter of 39cm). The new 8-tatami mat model is one size smaller and seems to have the same number of LEDs embedded in a 6-tatami mat housing. I think it's probably the same parts, but if you're concerned, please disassemble your light and check. (The width of the base board is 120mm) It will be wrapped in bubble wrap and shipped via Takkyubin Compact. Please refrain from price negotiations.