Revision 10-Dec2015:The interior chime and the external buttons seem to drain batteries at an alarming rate. Unless children are ringing my doorbell daily while I'm out, I think I heard the chime ring a dozen times before the batteries died. (In the interest of complete disclosure, the volume is turned up to be heard both up and downstairs, but still. Not what I expect.). Maybe I would not be so disappointed if I had paid the price listed today but I paid rather more.The sound is tinny and very plainly electronic - possibly sounding more artificially produced than the rings of the early cell phones. But to its credit, there are plenty of sound options, from the traditional ding-dong and the eight note "fancy" ding-dong in the old sitcoms, to the William Tell Overture (quite a lot to the sampling as I recall) and numerous Christmas tunes. (If you have four doors I think each could be assigned a different holiday tune.)Positioned on my second floor, the signal still arrives from both the front and back doors. (NOTE: My house does not have a very large footprint, so as the crow flies it is easily within the distance limitations BUT there are plenty of old plaster walls between.)The highest volume setting can be heard one floor up and down, but I doubt I would hear it that far away over a hairdryer or vacuum cleaner. I cannot hear it well in the basement either, but there is a fair amount of white noise in the background down there, between the blower on the HVAC, and the washer/dryer/dehumidifier trio.
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