I only wore this once for a Halloween event, but it has been stored at home for a long time, so please refrain from purchasing if you are sensitive to this. There is wiring on the left side of the skirt, and when you press the button, a fluorescent light flashes for a few seconds and then stops. It will light up again when you press it again. I confirmed that it lit up, but I don't know how long it will last, so please be aware of this. There is no size indication, but my daughter wore it when she was just one year old. Please be sure to read my profile. Halloween party Pumpkin Cosplay Baby cosplay Baby Halloween