The power supply is 12V, not 5V as the transformer states :(, and it also has a microphone! Everything is good regarding installation, build quality, and performance during the day, but at night, although it has normal sensitivity, the image is very blurry.
Continuing: after months of use, I accidentally saw comments from another country that it accepts an SD card, and with a 64MB card, it can hold many days of footage. The prerequisite for viewing and checking recordings is a good internet connection, which is not sufficient in the area.