100% Brand New.Material: PlasticColor: WhiteDiameter: 10cm/3.9inchThickness: 3.5cm/1.4inchSensor: Electrochemical CO SensorAlarm Style: Per EN50291LCD Displayer (Optional): 4 Digits LCD DisplayerAudibility: 85dB ( at 1m distance )， Frequency 3 - 0.5KHZStandby Current: <50��AAlarm Current: <50mAPower Consumption: 0.3mWPowered By: 3 x AA Batteries (Not included)Standby Mode: Green Led flashes once every 30 secondsAlarm Mode : Red Led quickly flashes 4 times with unit chirping every 5 seconds， then repeatLow-bat Indicator: Chirp every 30s as battery lower than 3.3V with green LED flashing and Lb on LCD.Mal-function Indicator: Chirp every 30s with green LED out and Err on LCD.Sensitivity/Alarm Time: Within 60~90 minutes at 50ppm CO concentration， Within 10~40 minutes at 100ppm CO concentration， Within 3 minutes at 300ppm CO concentration.This alarm is highly recommended to be mounted on a wall surface.Compact， lightweight & easy to operate.Package Content: 1 x Carbon Monoxide Alarm， 2 x Screws， 1 x User ManualNote: Due to the difference between different monitors， the picture may not reflect the actual color of the item. We guarantee the style is the same as shown in the pictures， but not the same performance on different bodies as on the model. Thank you!