Really nice article and easy to understand.

If you are related electronics i can suggest that you can use this device to make a wireless connection. It is so easy. Just connect the radio output (jack) to a standart point laser's anode and cathode instead of battery of the laser. You have a laser transmitter. If you send this laser any light detector which allows to collect the amplitude change from the radio, then with a simple circuit (amplifier) you can listen to the sound. According to the laser range you can send up this data for km in clear weather.

Thanks to remember such a beautiful thing...