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Features:1. MCU processing and SMT Manufacture Technology2. High accurate electrochemical sensor3. 3-5 years' sensor lifetime4. 85 decibel alarm soundLCD displaySimple installationLow battery warningManual Test / Auto-ResetTechnical Parameter:Power Supply:3 x AA batteries (without)Static Current:Less than 40uAAlarm Current:Less than 80mAAudibility:85dB ( at 1m distance ), Frequency 30.5KHZOperation ambient:4-38CEnvironment Humidity:20~95%R.HAlarm Output:85db/1m, 3Khz frequency, red LED light flash fastStatic Output :Green LED light flash every 30 secondsLow Battery Warning:Sound di every 30 second, displaying lbDimension100mm x 38mmcolor: WhiteMaterial: ABSPackage Contents:2 x Carbon Monoxide AlarmOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.