ADVISION, Intercom AD-101A, Talking distance is above 100m (2X0.8mm2)

ADVISION, Intercom AD-101A, the best security device ever, which helps you protect your real estate, home or organization with more than one modern anti-oxidation intercom system and technology, which performs multiple tasks from an external telephone unit as well as an aluminum soundproof door, DIY audio door phone.