Alarming
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Portable and self-contained the ' WEB Intruder Alarm is designed to look like a radio or intercom speaker. No special wiring is required for the device, which is mains/battery operated (a built-in rechargeable battery gives eight hours minimum operation).
A high-pitched two-tone warble is triggered off whenever an intruder comes within the unit's range—adjustable from two to eight metres (six to 25ft) with a 60 degree cone.
The alarm can be supplied with a secondary external unit which has a weatherproof circuit system. A feature crf the optional external unit is the automatic stand-by switch-over mechanism whereby the battery permits the alarm to be sounded even if the wire is cut. Available from: Business Aids Ltd, 3 Whitby Avenue, Park Royal, London, NWIO 7SQ.