An electrochemical paper-immunosensor and method for detecting aminoglycoside antibiotics is developed in the present invention. The arrays have rows and columns extending in x- and y-directions, respectively. A patterned photoresist mask is placed over the low-k dielectric layer. The body includes a central region and first and second wings. Some lens andor optical chain configurations are designed for use in small handheld devices, e. One of the four simple keystrokes is used to enter one of five other modes, which support generating uppercase, numeric, language specific and special characters and cursor control and editing control codes.