Proposed real world situation

Hello there!

Here is our proposed real world situation.

One's hobby is bird watching and listening. Thus he uses parabolic microphone to listen to the sounds made by the birds from a distance because as mentioned above, parabolic microphone can amplify a sound from a distance. If the person goes too near to the bird, he might scare the bird away. Hence, he uses a parabolic microphone which can be used to amplify the bird's sounds for him to listen, without him having to move near the bird.

Constraint: Weight and size of parabolic microphone must be movable and convenient to move around, distance from the birds, size of audio receiver

Variable: Diameter of the parabolic microphone