Environmentally friendly toner particles are provided which may, in embodiments, include a bio-based amorphous polyester resin, optionally in combination with another amorphous resin andor a crystalline resin. The antenna device is provided with an antenna for wireless LAN for transmitting and receiving radio waves, and a cover. The seamless body is made of a substantially rigid material, such as plastic, and may be roto-molded to form the seamless body. The beams and end parts include protrusions and grooves which are interconnected, and maintained in connection, by a wedge inserted into the slot between the end parts.