Deals on gentex gn 503ff hard wired smoke carbon monoxide photoelectric alarm with backup

GENTEX GN-503FF HARD-WIRED T3 SMOKE/T4 CARBON MONOXIDE PHOTO ELECTRIC ALARM-W/BA
$89.89
GENTEX GN-503F HARDWIRED T3 SMOKE & CARBON MONOXIDE T4 COMBINATION WITH BACKUP
$74.69