A formatted data unit that was transmitted by a transmitter is received at a receiver. Apertures in the heel andor sole andor midsole communicate with an air compartment in the heel andor sole andor midsole, and as the wearer strides, the heel andor sole andor midsole are compressed, expelling the air from the compartment and into the footwear upper. The electrophoretic display medium and the electrophoretic display device each using the above display liquid for electrophoretic display have a high contrast on a display face and can display the contrast with high reliability even in repetitive display, and they are excellent as well in a response. The low melting point metal balls are adhesive bonded to the electrodes preferably with a flux. The support chair is preferably configured to support rebar at any one of multiple different heights. The contact surfaces of the current supply housing and the current tap housing make contact earlier than the contact surfaces of the current supply housing and the magnet carriage on connection of the current supply housing and the current tap housing and on disconnection are in contact longer.