three rows of openings 28 the rows have an arc shaped design designated by the lines having reference numerals 30 32 and 34 for each of the first second and third rows respectively the arc shaped design accommodates the conductive key pad members 38 the conductive key pad members 38 are similarly divided into three rows 40 42 and 44 designating the first second and third rows respectively as will be appreciated from the more detailed explanation found with reference to fig6 the conductive key pad members 38 are generally flat and each includes a nipple 92 which protrudes away from the second side of the pc board pressure from the tip of a user 39 s tongue deforms the pad members 38 and pushes the conductive surface of the pad members 38 through the opening 28 of the adhesive spacer 26 and into electrical contact with the second side 24 of the pc board as best shown in fig7 the intra oral transmitter assembly 12 is encapsulated by an encapsulant 46 made of methyl methacrylate as shown more clearly in fig2 and 3 the methyl methacrylate encapsulates the pc board 20 the adhesive spacer 26 and the keyboard membrane 36 the bottom of the operating surface of the keyboard membrane 36 which includes the nipples 92.