Review: Very fast shipping десятидневная.
9 v crown (not included). first thought that the device NK working: tried while holding the button could move along the wall, the device the buzzer squeaked constantly bulbs were exactly as if the wall-metal. after reading the instructions (in English) it turned out, that the detector calibrated each run. a couple of times turned on/off, and it worked properly. so, do not immediately upset, if your "четырехглазым" happen like when you first start.