Best First Alert Door Alarms

First Alert CO605A Carbon Monoxide Plug-In Alarm with Battery Backup

FIRST ALERT Smoke and CO Alarm, SC7010BA, White

First Alert Hardwired Wireless Interconnect Smoke Alarm

CPVAN Home Alarm System Wireless, DIY Smart Door/Window Alarm for Home Security, WiFi Alarm with Phone APP Alert 13 Pieces-Kit (Alarm Hub, 8 Door Sensors, 2 Remotes, 2 RFID Cards)

GE Personal Security Window/Door Alarm, 5-Pack, DIY Home Protection, Burglar Alert, Magnetic Sensor, Off/Chime/Alarm, Easy Installation, Ideal for Home, Garage, Apartment, Dorm, RV and Office, 45987

First Alert Battery Operated Carbon Monoxide Alarm with Digital Display

Yolink Smart Wireless Door Sensor, APP Alerts Smart Door Window Sensor Smart Home Security System, 3 Packs

Door Chime for Business When Entering - BITIWEND Wireless Doorbell Chime - Door Alarm Sensor with 600 FT Range 58 Chimes 5 Volume Levels LED Indicator (1 Plug-in Receiver & 3 Door Sensor)

SanJie Door Sensor Chime for Door Opens, Door Entry Chime for Business/Home/Office/Store,800 FT Range,55 Chimes 5 Adjustable Volume Door Ringer Alert Alarm 2 Receivers +2 Sensors

WSDCAM Freezer Door Alarm When Left Open, 3/15/30/60 Seconds Adjustable Delay Wireless Fridge Alarm, 4-in-1 Door Sensor Chime Door Open Alarm Loud 108dB, Refrigerator Alarm 2 Pack