On the positive side, it has rechargeable controllers. It is also an economical alarm. On the negative side, it drains the battery for fun. With daily use of the machine, now in winter if I arm it and at night... it cries. Also, when it rains, it gets blocked and keeps hitting constantly. In short, due to the fact that it does not reach 100 meters in any case if a wall intervenes, that is, if you have it next to the office - home, try to be in the square to hear it, the intercom is useless. Prefer one without it and save your battery.