Ok. you need to talk privatly, while they have surveillance van's cross the street...you record white noise, and push the bottom...

http://www.ebay.com/itm/8GB-Portable-Digital-Sound-Voice-Recorder-Pen-Black-A6J4-/122447115095?epid=580053148&hash=item1c826ab357%3Ag%3AsvIAAOSwnF9Y8QUY

White Noise with HTML5 Audio API - COUNTER SURVEILLANCE

window.AudioContext = (window.AudioContext ||
                       window.webkitAudioContext ||
                       window.mozAudioContext)

context  = new AudioContext()

osc = context.createOscillator()

noiseGain = 0
whiteNoise = context.createScriptProcessor(4096, 1, 1)
whiteNoise.onaudioprocess = (ev)->
  output = ev.outputBuffer.getChannelData(0)
  for i in [0...whiteNoise.bufferSize]
    output[i] = noiseGain * (Math.random() * 2 - 1)

$("#noise").click ->
  $(@).val if noiseGain is 1 then "on" else "off"
  noiseGain = 1 - noiseGain

osc.connect(whiteNoise)
whiteNoise.connect(context.destination)

https://codepen.io/koheishingai/pen/yOMVxe

1 HOUR ✒ Fountain Pen WRITING SoundㅣASMR, White Noise

EMP Jammer disable airplanes electronics