| 摘要 |
A self contained electronic apparatus comprises an internal power supply 9 and a display window 7 to display a pseudo-random number or quasi pseudo-random number, the number being generated when a first internal electronic beam is broken. The number is illuminated for a predetermined length of time then ceases to be illuminated, and may be re-illuminated when a second internal electronic beam is broken. The apparatus is also arranged to illuminate a warning when the internal power supply is reducing. The apparatus may be a security seal comprising a flexible cable 3 with an end 2 which is received in a socket 4 in a housing 1. The cable end may be released using a release button 5, and when re-inserted into the socket may pass between sensors 11 to break the first beam, thus generating the number. The second beam may be broken by a user placing a finger between sensors 11, thus re-illuminating the number. Any change in the displayed number will indicate that the seal has been tampered with. The security seal may be used to lock a container, such as an airline trolley (14, Fig. 4). |
