«  it is doing its job »

Hello,

I had a little apprehension about the brand, but after use I am fully satisfied, after calibration it is reliable

pity he was not a built-in microphone (in some cases sufficient to use) because it is not always easy to bring him the signal, simply because it should not count too much to recover the signal's hello if the breath out, so it necessarily a signal line dedicated ...

I still do it again this choice