| 摘要 |
The invention relates to an autonomous electronic time countdown device with a display, which is easily transportable and usable without other equipment or specialised infrastructure. It consists mainly of a digital display unit 1, of a time base 2 supplying a periodic reference signal for the debit operations, of an permanent electrical power supply unit 3, of a keyboard 4 allowing the electrical power supply to be activated or deactivated and the information to be supplied from an up-down counter device 5. The device according to the invention is particularly intended to be used as a parking disc, that is to say as an individual and autonomous electronic parking meter. <IMAGE>
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