Product Information:About the First Alert FCD4CN3 PlugIn, Carbon Monoxide Alarm with Digital Display amp; Remote Control Test/SilenceThe First Alert FCD4CN3 is a carbon monoxide alarm with a digital display that you can plug in. Compatible IR remotes let you control the device so you can test it and silence the detector from the comfort of where you are. You can operate the device with most household TV/VCR remotes.The digital display on the First Alert FCD4CN3 is crisp and clear so you can easily read the statistics. The display is built with Peak Level Memory. When the alarm detects carbon monoxide, LEDs flash so you know there is a hazard and a constant red light let you know the power is on. An 85decible alarm sounds if something is detected. The interface includes a test and silence button, which lets you test the device with ease.A 9V battery is included in the system and is a backup power source if the power goes out. The First Alert FCD4CN3 comes with a 5year limited warranty. Features:#149; Plugin with battery backup. Works during power outages#149; Remote control Silence/Test. Uses most remote control devices to silence or test alarm#149; Digital Display. Stores, recalls, and displays highest level of carbon monoxide detected#149; Simple to use silence/test button; low battery warning; endoflife timer and loud 85decibel alarm#149; 5 year limited warranty Specifications:#149; Alarm Dimensions: 5.3"L, 3.3"W, 1.4"H#149; Operating Voltage: 120 VAC, 60 Hz, 9V DC#149; Power: .09 amps#149; Temp Range: 40F (4C) to 100F (38C)#149; Humidity Range: 10 to 90 Relative Humidity#149; Audio Alarm: 85dB at 10 ft.#149; Test Button: Electronically simulates a carbon monoxide condition, causing the unit to alarm#149; Alarm Reset: Automatic when CO clears; Press Test/Silence button to reset manually#149; Indicator LEDs: AC Power: Constant Red LED#149; CO Alarm: Audio Alarm (4 beeps, pause, 4 beeps) and rapidly flashing Red LED#149; Listing: UL2034