An electrical outlet comprises an outlet housing having a front side adapted to receive a face plate and a back side. Push rim wheelchairs having such transmissions are also provided. The current signal supplied to the input-side current path of the current mirror circuit section is mirrored in the output-side current path and is then converted into a voltage signal through a resistor disposed in the path to be generated from an output terminal. The local communication device receives, from the wireless module by second local communications, a second signal destined for the field device that is wirelessly transmitted from an external device and wirelessly received by the wireless device. The mirror includes a substrate, a metal film formed on the substrate, and an reflection enhancing film stacked on the metal film.