fire alarm system monitoring
$50, which is covered in our section on combination smoke and CO detectors. Both of these smoke alarms use wireless technology to create their interconnected network. If you already have a wired network in place, the First Alert 7010B Est. $20 is a photoelectric smoke detector to consider. Also sold under the BRK brand, this smoke detector can be used on the same network with pretty much all current BRK and First Alert interconnectable smoke and CO detectors. You don't get the talking technology found in the pricier First Alert models, but there are latching indicators so you can see which smoke/CO detector in the network initiated the alert.