Cheap and no processing functionality. After the equipment arrived after 10 days, I opened it, and then put the battery ... nothing. No reaction to the one-off beeper at the beginning. I opened the device and realized that was the capacitor already over. Dar, the alarm was not very expensive I also expect anything else. Even after repeated contact by e-mail was no answer. Just bad and recommend nichtvzu. The one star I can forgive it, because the part arrived at all!