Transmitter capriceux

After installation of new batteries into the transmitter and the receiver (following the instructions and the indicated times), very difficult to synchronize the two, after ten attempts, hurray! it works! The more you do not touch anything!
However, the transmitter batteries must be fully charged if the battery is a bit low: more show.
Disappointed, I bought another model of the same brand, and whatever the battery charge and distance, it works flawlessly.
Model to avoid!