In the main, however, the batteries were to all devices within a few months empty (beep - Again, I had to conclude that the signal indicates an empty battery, as in the instructions to a word). After replacement with new brand batteries (both the block and the small batteries) worked all a few weeks, then the beeping started again. However, the batteries were not empty. The whole game then again - such a battery change go at 8 devices thoroughly into money!
Then there were several false alarms from non-obvious reasons, the frightened us and especially our son to death.
Meanwhile, all devices are uninstalled.
We are of inferior quality, that would not solve an exchange.
I can not understand all the good reviews and can only explain it to me so that the customer review upon receipt and successful installation, not only after a certain period of operation, when the devices were able to prove or not.
