Carbon Monoxide Detectors Portable Temperature Detector/Humidity Sensor/Air Quality Meter Smoke CO Gas Monitor [3 in 1] Alarm for Home Bedroom Office in-car Camping Indoor Outdoor

SKU: GW40.0007

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The box that it came in has “UL” printed on it. 
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Yes. You hold down the bottom/center button for a few seconds until it turns OFF. 
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Seems like long term- like a radio or other electrical device. 
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Dear Customer, if the CO ppm is continue upper than 50, the alarm will sound ""di di di"", if the detector come with any quality issues, please contact us, we will help you solve the problem immediatey. Please don't worry about it. 
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To extend the CO detector's working time, the backlight will turn off when there is no operation or alarm signal, but the detector still continue detecting CO per 2s. The audible alarm will sound ""di"" every minute when battery is low power. 
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The alarm is not a piercing siren, but rather a common electronic beeping noise, rather moderate level. No dB readings taken. 
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We re-write the mode to a power-saved design. the CO detect's screen backlight will turn off if there is no operation after 1 minute, but the CO detector the carbon monoxide, humidity, termp in 2 seconds. Pls don't worry about it. If the CO detector is in low power, the alarm will sound ""di"" per 1 minute. This new poer-saved mode helps to increase the continue working time to 60 hours with full power. 
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About 4-5 hours I got bit just keep it plugged in in my camper when camping 
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Yes …. You can use anywhere it goes with you… I use mine in our camper