<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5

<S>                             <C>                     <C>                     <C>
<PERIOD-TYPE>                   3-MOS                   6-MOS                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1997             DEC-31-1997             DEC-31-1997
<PERIOD-START>                             JAN-01-1997             APR-01-1997             JUL-01-1997
<PERIOD-END>                               MAR-31-1997             JUN-30-1997             SEP-30-1997
<CASH>                                         211,521                 527,885                 660,470
<SECURITIES>                                15,786,906              14,205,671              12,512,006
<RECEIVABLES>                                  122,581                 123,274                 373,943
<ALLOWANCES>                                         0                       0                       0
<INVENTORY>                                    306,104                 542,925                 709,938
<CURRENT-ASSETS>                            16,567,386              15,511,154              14,374,711
<PP&E>                                         555,229                 535,736                 591,180
<DEPRECIATION>                                 330,256                 381,124                 434,468
<TOTAL-ASSETS>                              17,215,133              16,141,293              15,058,484
<CURRENT-LIABILITIES>                          778,569                 781,653                 944,578
<BONDS>                                              0                       0                       0
<PREFERRED-MANDATORY>                                0                       0                       0
<PREFERRED>                                          0                       0                       0
<COMMON>                                         5,601                   5,629                   5,629
<OTHER-SE>                                  16,430,963              15,354,011              14,108,277
<TOTAL-LIABILITY-AND-EQUITY>                17,215,133              16,141,293              15,058,484
<SALES>                                        203,727                 218,496                 476,293
<TOTAL-REVENUES>                               203,727                 218,496                 476,293
<CGS>                                          394,298                 408,722                 559,052
<TOTAL-COSTS>                                1,539,974               1,551,533               1,964,787
<OTHER-EXPENSES>                                     0                       0                       0
<LOSS-PROVISION>                                     0                       0                       0
<INTEREST-EXPENSE>                              18,919                   1,755                   1,237
<INCOME-PRETAX>                            (1,139,852)             (1,123,959)             (1,298,734)
<INCOME-TAX>                                         0                       0                       0
<INCOME-CONTINUING>                                  0                       0                       0
<DISCONTINUED>                                       0                       0                       0
<EXTRAORDINARY>                                      0                       0                       0
<CHANGES>                                            0                       0                       0
<NET-INCOME>                               (1,139,852)             (1,123,959)             (1,298,734)
<EPS-PRIMARY>                                    (.20)                   (.20)                   (.23)
<EPS-DILUTED>                                    (.20)                   (.20)                   (.23)


</TABLE>