An electro-optic apparatus includes an electro-optic panel, a wiring board, and an integrated circuit unit. The dual core comprises an interior center component formed from a thermoset material, a thermoplastic material, or combinations thereof. The coating film formed therefrom has a chromatic color or a white color as an achromatic color onto the cured cationic electrodeposition coating film. The antenna attachment member and the exterior body portion are secured to each other via interlocking geometry of a rim of the attachment member and a channel of the exterior body portion.