is shown on the display panel 14 please refer to fig5 which is a diagram of simultaneously pressing two adjacent input units suppose that the user simultaneously presses the input units 22 and 24 thus the t shaped bridge 30 has a vertical displacement without any incline so that the two contact portions 32 and 34 respectively trigger the circuit switches 42 and 44 thus a second character other than the first character corresponding to the pressed input units 42 and 44 is shown on the display panel 14 the number of input units buttons formed on the portable electronic device 10 depends on different requirements and thereby there is no limitation in the number of input units for instance the chinese phonetic notation having thirty seven characters requires more input units than the english alphabet does the input units of fig2 are not enough for the chinese phonetic notation the number of input units in fig2 is twelve and the number of two adjacent input units is seventeen totally having twenty nine inputs therefore to add eight inputs in the arrangement of fig2 for the chinese phonetic input method can be achieved by simultaneously pressing three or more than three adjacent input units or non adjacent input units cooperating with direction keys soft key or side key or including additional input units pressing three or more than three input units at the same time can be achieved by using two bridges another embodiment of the present invention is shown in fig6 fig6 is a top view of a t shaped bridge 50 positioned beneath four adjacent input units if simultaneously pressing input units u201c 1 u201d u201c 2.