| 摘要 |
A device for transmitting data from a movable unit such as from a domestic a nimal contains a conventional passive transponder unit (1) which is coupled to an antenna (3). The transponder (1) comprises means (23) for storing electrical energy comprised in electric al voltage pulses received on the antenna (3) and can by means of the stored en ergy transmit on the antenna (3) pulse sequences carryin g information such as identification data for the device. Further, in the devi ce a permanent electrical current source such as a lithi um battery (9) is provided, which powers a processor (7). The processor (7) receives si gnals from a motion sensor (15) and is coupled to a tran smitter (11) having an antenna (13) and can activate the transmitter (11) for transm itting radio signals having a good range, when the motio n detector (15) signals an increased activity, such as for a non-milking cow d uring the estrus period.
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