Ключевые слова: access, alarm, background, black, business, button, call, code, combination, communication, computer, connection, contact, device, dial, digital, door, electronic, entrance, entry, equipment, home, id, identification, internet, key, keyboard, keypad, mobile, number, opening, password, phone, plastic, plate, press, protection, push, safe, safety, security, service, support, symbol, system, technology, telecommunications, telephone, unlock, white,