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Phone Activated Relay (Paper Plans)

Price:
$5.00
SKU:
TEL3
Shipping:
Calculated at checkout


Product Description

Useful circuit activates when telephone is used allowing control of other devices. Many uses from turning "on" or "off" lights, alarms, sprinklers, radios, recorders, video and voice transmitters etc.

These are paper plans, requiring parts and assembly.

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