The present invention provides a method and apparatus for controlling the moving speed of a substance, both of which can adjust the moving speed of a substance to a desired speed. A restriction member is rotatably connected to the frame. The conductive layer is disposed on the substrate and an outer perimeter and an inner region thinner than the outer perimeter. The printer comprises an actuator, a coded data generator configured to generate the coded data based at least partially on the first identity data, and a printing mechanism. The apparatus includes an AC to DC converter that receives an AC power input and outputs DC power to the power over Ethernet circuitry and a DC battery pack that provides backup DC power to the power over Ethernet circuitry. The second socket members are spaced apart from each other at a desired angle and rigidly secured on one side to one of the first socket members and on another side to the other first socket member to form the socket.