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I recently replaced the 14-year old smoke alarms in my home with these 9120B units (identified as the suitable form-fit-function replacements for the contractor grade units that were installed when my home was built). Good price for a 6-pack. Installation was a breeze since the power leads from the old units worked without modification for the new units. Note: old units had labels indicating a 10-year service life, so if your home is older than 10-years you should consider replacing your residential smoke alarms.