1 a wasting away of the body, as from poor nutrition, nerve damage, or disuse. 2  to undergo atrophy; wither; degenerate:His crippled leg began to atrophy with no exercise. 3  to become weakened; decline:Industry atrophied in bad economic times.
Voice Amplifiers / Long Range Listening Devices. Listening devices can be utilized for a variety of purposes including listening through a wall, listening from a distance or enjoying your favorite animals in the wild. More complex systems contain an audio transmitter and receiver.
Near Field Communication. A technology standard for very-short-range wireless connectivity that enables quick, secure two-way interactions among electronic devices. NFC technology typically takes the form of a small chip embedded in a phone or a plastic card (like a credit card). The phone or card is simply placed on or very near a reader device (such as a pad on a debit card terminal, kiosk machine, or turnstile) - or another portable NFC device - to initiate a transaction.