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For extra safety and control, check out our guide to the best smart doorbells. The Ardwolf sensor uses a 9 volt battery that features a long lifespan. It also makes use of a red LED accompanied by an intermittent chirp that sounds every 32 seconds to signify that your battery power is low. One major feature of this unit that stands out from its competition is its durability. When maintained properly, the Ardwolf smoke detector types can operate for as long as ten years with no issues. Its ten year service life is due to its low power consumption and the use of a UL listed battery.