1. An electronic identification system comprising: a reader including means to generate, radiate and identify a carrier frequency signal; and an identification card having an electronic circuit and comprising; means to receive said carrier frequency signal radiated by said reader; means to generate power from said carrier frequency signal to energize said card electronic circuit; a counter to receive and generate secondary radio frequency signals by dividing said carrier frequency signal; a data memory for recording an identification code identifying said card; means to access said data memory and select said secondary radio frequency signals responsive to said identification code; and an antenna connected to receive and radiate said selected secondary radio frequency signals to said reader to allow said reader to identify said card.