very good sensitivity

I do not understand why one writes in a comment:
"Attention has done outside if there is a wall in the shooting places its risk does not work"
It's a feeling not a fact .......
It's like saying:
'Attention with a mobile phone, outside if there is a wall in the call places it might not work "
I've tested it with my boyfriend a YN-622c receivers in a shooting in bunkers, well really need receivers are at the bottom of the corridors meander thereof so that it does not work! !!!
The frequency of use is wedged on the 2.4GHz, highly reliable frequency but has the reputation of not crossing the water, I do not intend to use the system YONGNUO dive, but I ' have used wedged behind a giant aquarium, and there no concern, the waves will surely reverberate everywhere and so come to receivers without problems.
By cons flash and receiver placed in a sealed box and put food IN the aquarium, where it does not pass unless it's very very close to the wall, same in a pool.
But this is not common usage that everyone will !!!!!!
It is also true that the 100 meters are often overwhelmed announced, we made tests up to 150 meters without problems with Eneloop batteries yet does not offer a 1.5 V alkaline battery, but already 100 m c is huge. A test was made with flash set to +/- 50 behind shrubs surrounding the model, and although at this distance the flash of cobra hand well, but brings no effect (or so little) in the photo? It is in my view a characteristic that will never be fully exploited.
For the rest, apart from the leaflet that is not in French, but there are adjustments on the net, it is a very good product that also has the courtesy to use standard AA batteries, not found and expensive lithium.
Only the display a little sin for two reasons
1. According to the aggressiveness of the ambient light and the angle at which you look at the screen, you sometimes play the hand like a lens hood to read information.
2. The AFN is put on a foot a little high (I'm not very large) forces me to either put me on tiptoe, or tilting the head up to read the screen .
A vertical arrangement of YN-TX 622c would have been more cumbersome, but more comfortable in use.
But it's really to quibble and find something to say about this unbeatable product price level, sure Cactus and other systems took a holy slap with the arrival of 622.
The grand luxury would be on the TX, the presence of a witness flashes loans for where cobras are placed far away or inaccessible.
I came across a shooting pro there a while now near Montmartre, the photographer was using YN-622, including a TX (in Nikon Version), if a pro trusted this material, I think it shows anyway a certain level of reliability ......