malfunctions!

Given the quality of the product would throw confident to buy, but I quickly became disillusioned! 1ér delivery from two collars was not working or very little, and so back I recommended a new, 2èm delivery ... still the same problem with the added self-barking system also was not working, so return today.
I am very disappointed because the external quality (plastic, sealing) is there, but the rest of it did not, really bad there was not an audit of further product!
I do not recommend it at all even if the price and quality it is tempting, there really is a concern on the products manufactured since 2 of 2 (when Mêm!) are defective.
by cons when it works (since soon two was good) it works very well.
pity, I am very disappointed ....