Convenient, and fast! 2

I have not found better, especially with two receivers boxes running on a socket each, with different melodies to each other if desired. I chose for myself the dog barking, little strident. This is only a detail but the sticker double sided push button (transmitter) is not quite the pre-cut holes in the same place, but it is not a handicap! Certainly, we must appropriate the beast to the melody chosen not to return to the box "Preset". Keep the volume key down until the blue line flashes. The machine is in learning mode and you can choose the melody you like by scrolling with the other key. As there are many, good luck! When you find, hold the volume button pressed until you hear a sound and the blue flashing disappears. Check with the push button. The installation took me a quarter of an hour, including settings. Last, in the Amazon catalog and under this unit face a similar (except dressing and a receiver with batteries on both) same manufacturer, same sender. Only the second offer is free shipping! Find the error! A forced sale of Amazon for transportation "premium"? It is still too violent and unjustifiable!
Another thing: despite my repeated requests, to date I have not received a bill for the purchase of this item! What does the DGCCRF?
willycopresto