Some embodiments of the present disclosure provide a graphical user interface as a means of inputting search parameters to database search engines. With this arrangement, it is made possible to accurately detect whether a received signal is correct or not and malfunctions owing to incorrect signals leaking out from the external recording device to the printer can be prevented. The flexible substrate also includes a spatial separation between the electrode modules of the modular electrode array, and conductive interconnect coupled to the electrodes of the plurality of electrodes.