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The two First Alert smoke detectors can be mixed and matched to create a smoke detector network that covers your premises. If you have a pre existing interconnected hard wired smoke detector network, a First Alert SA521CN 3ST sometimes sold as simply the First Alert SA521CN can be substituted for one of the existing units to act as a bridge so that when one smoke detector is activated, all smoke detectors on both networks will sound an alarm. This can be an effective way to integrate new, interconnected photoelectric smoke detectors with an existing hard wired interconnected ionization smoke detector network for protection against all types of fires. The alarms are also compatible with interconnectable First Alert CO and combination smoke and CO alarms, such as the First Alert SCO501CN 3ST Est. $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.free medical alert systems for seniors
If you have any question about the camera, or if you find any camera defects and would like a refund or replacement, please kindly send message to our service email: Professional customer services will be provided to solve your concern. Plug and play with Easy Configuration within 2 minutes: 1. Plugged in for power supply 2. Download App to remote control 3. Register and Scan QR code to add the camera network cable is provided for wired connection in case any need 4. Start your clear remote view with the app Important notes about the camera: 1. Do not support the onvif protocol. 2. The camera can only support 2. 4G WIFI, 5G is not compatible. 3.