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.
Some long-range wireless doorbells can extend the sound range distance from 300 to 500 feet, with select units extending up to 3,000 feet. Depending on your homeâs construction, thick internal walls or stone walls may interfere with the signal. In this case, you may want to consider a wired doorbell system.