| 摘要 |
Device for preventing a credit card or the like being forgotten. The invention relates to a device making it possible to send out an audible beep when the card is taken out of its storage. It consists of a box 9 in which is installed a sound system composed of a battery 5, switch 6, quartz 3 oscillator chip 4. On the box a screen 7 and a keyboard 8 may be mounted for viewing the secret codes. <IMAGE>
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