Ultrasonic alarm
26th November 1971, Page 42
26th November 1971
Page 42
Page 42, 26th November 1971
— Ultrasonic alarm
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An anti-burglar device from Delta Security emits ultra-sonic beams and monitors an area of up to 300 sq ft. It is attached to a horn unit.
The DeltAlert package incorporates an alarm alert consisting of a tiny red light flasher for exterior mounting. This small red warning light will continue to flash until the main system is switched off. The system is powered by mains supplies but has two 6V dry batteries on standby which come into operation in the event of power failure.
Made by: Delta Security Ltd, Castle Street, Axminster, Devon.