Ok, now take your head out of your tinfoil hat and realize that one case doesn’t make the rule for all.
RCA WHP141 900MHZ Wireless Stereo Headphones
In the [United States](http://en.wikipedia.org/wiki/United_States), seven [frequency](http://en.wikipedia.org/wiki/Radio_frequency) bands have been allocated by the [Federal Communications Commission](http://en.wikipedia.org/wiki/Federal_Communications_Commission) for uses that include cordless phones. These are:- 1.7 MHz (1.64 MHz to 1.78 MHz & up to 5 Channels, AM System)[2]
- 43–50 MHz (Base: 43.72-46.97 MHz, Handset: 48.76-49.99 MHz, allocated in November 1984 for 10 channels, and later 25 Channels, FM System)
- 900 MHz (902–928 MHz) (allocated in 1993)
- 1.9 GHz (1880–1900 MHz) (used for DECT communications outside the U.S.)
- 1.9 GHz (1920-1930 MHz) (developed in 1993 and allocated U.S. in October 2005, esp. re DECT 6.0)
- 2.4 GHz (allocated in 1998)
- 5.8 GHz (allocated in 2003 due to crowding on the 2.4 GHz band).
There is one model of phones which matches the frequency generally used by some wireless headphones.
Even if that is the case…
900 MHz cordless phones are still sold today and have a huge installed base. Features include even shorter antennas, up to 30 auto selecting channels, and higher resistance to interference. Available in three varieties; analog, analog spread spectrum (100Khz bandwidth), digital, and digital spread spectrum, with most being sold today as budget analog models. Analog models are still susceptible to eavesdropping, However, older used models can still be found that are fully capable of receiving this spectrum. Digital variants can still be scanned, but are received as a digital hiss and therefore are difficult to eavesdrop upon
Digital Spread Spectrum (DSS) variants spread their signal over a range of frequencies providing more resistance to signal fade.This technology enabled the digital information to spread in pieces over several frequencies between the receiver and the base, thereby making it almost impossible to eavesdrop on the cordless conversation
Not to mention you have to be in range and the range on these things is terrible.
Seriously - just because you find a video of one dog barking what appears to sound like a word it doesn’t automatically mean that all dogs talk…