A trainable transceiver may comprise an electro-optic element comprising a first substrate having an electrode coating on a surface; a second substrate generally parallel to and in a spaced-apart relationship with the first substrate and having an electrode coating on a surface; and a window in at least one of the first substrate and the second substrate from which the electrode coating has been at least partially removed. The trainable transceiver may also comprise a machine-readable optical image selectively visible through the window; a light source disposed in proximity to the machine-readable optical image; and a controller capable of controlling the light source. Upon receipt of an appropriate input, the controller causes the activation of the light source which, in turn, causes the machine-readable optical image to be visible through the electro-optic element.