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It's called biometrics. In addition to your eyes, it can scan your fingerprints or recognize your voice. It's a great choice for people with fat bank accounts who harbor government secrets, but for the rest of us, digital door locks offer a cheaper home security option. Digital door locks can be opened with an electronic "smart key" or a remote, or you can open them by typing numbers on a pin pad. These locks are almost impossible to pick. ADT Home Security: Is Your Home Protected?American District Telegraph Company, now known as ADT, the number one name in home security was established in 1874 when 57 Baltimore telegraph offices became partners. ADT was first a part of Western Union, then ATandT. It explored on technology research related to signaling business, making the company identical with emergency call systems. World War II paved the way for a major breakthroughs alarms that signaled automatically to enhanced protection of families left home and secure supply factories. In 1974, on its 100th anniversary, ADT opened its first automated Central Monitoring center in Houston, Texas. Central Monitoring is one of the attributes that customers value primarily in an ADT system.
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Which one is more convenient?Obviously, you would prefer a cell phone, since it is easy to carry anytime, anywhere.
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“It is still very early days.