<instructions>Your goal is to analyze the following comment and estimate how highly it will be upvoted by the Hacker News community.</instructions><comment><author>bcheung</author><text>Here&amp;#x27;s a neat party trick for you.&lt;p&gt;I had a MacGyver moment in the past where I made a phone call with only are pair of old earbuds and a phone cord (no switches, no dial pad).&lt;p&gt;A speaker is basically the same thing as a microphone in reverse.  Normally it takes an electrical signal to move a physical element that creates the sound waves.  But you can also move the element and it will generate an electrical signal.&lt;p&gt;To dial you can use the old rotary trick.  The old phones dialed by pulses of quickly disconnecting and reconnecting.  You can do that by hand if you want but it might require a little bit of practice and dexterity.  Basically if you want to dial a 5, just disconnect the wire from the headphone to the phone cord and then reconnect it 5 times in a row.&lt;p&gt;You have to both listen and speak through the ear bud.  Not the best quality or easiest to do but it works.</text><parent_chain></parent_chain></comment><story><title>Headphones can be hijacked to surreptitiously record audio</title><url>https://www.wired.com/2016/11/great-now-even-headphones-can-spy/</url></story>
<instructions>Your goal is to analyze the following comment and estimate how highly it will be upvoted by the Hacker News community.</instructions><comment><author>elcapitan</author><text>Interesting research, but with people already plugging those headphones into a portable surveillance set, and plus them using headsets (which are already microphones as well), this seems a bit chasing the wrong target?&lt;p&gt;(Assuming that the connected computer is compromised also already implies that the attacker has a microphone at their disposal, with most modern devices like smartphones, tablets and mobile computers)</text><parent_chain></parent_chain></comment><story><title>Headphones can be hijacked to surreptitiously record audio</title><url>https://www.wired.com/2016/11/great-now-even-headphones-can-spy/</url></story>