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.
Walkie talkie range, or the maximum distance of communication, varies with the amount of power the transceivers produce. A 0.5-watt system might require users to be within 100 yards (91.4 m) of each other, while a 5-watt system might extend that distance up to 10 miles (16 km). The maximum communication range is generally determined under perfect conditions, meaning that there are no forms of obstruction between the two walkie talkies.