The device even produces a small amount of white noise to give any unexpected guest the impression they are speaking to someone inside the house on an intercom system.
The invention, which uses an inbuilt SIM card and existing mobile-phone technology, would also allow homeowners to give instructions to drivers making deliveries at their property.
Laurence has already sold 20,000 units to a telecommunications company.
Link via Blame It on the Voices | Photo: Craig Hibbert
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