The sound amplifier listening and observing package enables you not only to hear sounds of any volume over 100 meters and even record them, but also to follow objects optically with no need of using extra monoculars. With this sound simplifier listening device at hand, even the faint singing of birds can also easily be detected. The built-in digital recording chip can be used for recording for 12s, playback or copy the file onto a standard audio tape for preservation.Designed with a powerful optical zoom viewfinder function with a magnification of 8x, you are able to follow objects optically with no need of using extra monoculars. Lightweight and running on a 9V battery (not included in delivery), it is easy to carry from place to place. This high-quality sound amplifier listening and observing device is definitely a surprise for every opera-lover, bird watcher, animal observer, etc.