What n.c and n.o stand for?

It is for the one with a relay. NC normally closed NO normally open

Does it pick up kerosene odor? Because I have propane heat and I also use kerosene..

I don't know if it picks up kerosene, bit I would think so. It picks up alcohol and eine when I cook with them

Does a carbon monoxide tester also detect propane?

Hello, this product is not a carbon dioxide detector, it is a combustible gas detector. You cannot detect carbon monoxide, but you can detect propane , please install it at 1 feet (0.3 meters) higher than the ground, because the propane is heavier than the air, and it cannot be installed too high.

Is this alarm listed by Underwriter Laboratories?

I looked at the instruction manual and the box and it doesn't say anything about being UL listed. It is built in China but I don't know if that has anything to do with what is or isn't UL listed. Sorry I couldn't help more.

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Natural Gas Leak Detector, Plug-in Propane Natural Gas Detector for Home Kitchen RV, Combustible & Explosive Gas Alarm for LPG, LNG, Methane (AC Power)

Natural Gas Leak Detector, Plug-in Propane Natural Gas Detector for Home Kitchen RV, Combustible & Explosive Gas Alarm for LPG, LNG, Methane (AC Power)

Product ID: 166241582

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Details

Brand
HSTMYFS
Style
AC Power
Power Source
AC
Color
Light white
Product Dimensions
1.3"D x 2.7"W
Item Weight
0.3 Pounds

⚡Plug-in AC power, no batteries

🔥85 dB loud alarm

🌡️Operates up to 50°C

Description

🔥 Stay ahead of danger with plug-and-play peace of mind!

COMPACT DISCREET DESIGN - Slim, light white profile fits seamlessly in kitchens, RVs, or any space
PLUG PROTECT SIMPLICITY - No batteries needed—just plug into any AC outlet and stay secure
MULTI GAS DETECTION MASTERY - Detects LPG, LNG, Methane & Propane for total home safety
INSTANT AUDIBLE VISUAL ALERTS - 85 dB alarm with flashing light ensures you never miss a leak
TRUSTED DECADE LONG RELIABILITY - Proven stability with over 10 years of trusted performance

The HSTMYFS Natural Gas Leak Detector is a compact, plug-in device designed to detect multiple combustible gases including LPG, LNG, Methane, and Propane. Featuring an 85 dB audible alarm and visual warning system, it ensures rapid alerts to potential leaks. Powered by standard AC outlets with no batteries required, it offers easy installation and reliable operation up to 50°C. Backed by over a decade of proven safety and quality, this detector is an essential safeguard for homes, kitchens, and RVs.

Specifications

Brand	HSTMYFS
Style	AC Power
Power Source	AC
Color	Light white
Product Dimensions	1.3"D x 2.7"W x 4.8"H
Item Weight	0.3 Pounds
Alarm	Audible
Operating Humidity	95 percent
Upper Temperature Rating	50 Degrees Celsius
Sensor Type	Gas Sensor
Number of Items	1
Manufacturer	HSTMYFS
UPC	778957530580
Part Number	BRJ-502E
Item Weight	4.8 ounces
Item model number	BRJ-502E
Voltage	110 Volts (AC)
Item Package Quantity	1
Included Components	Gas Detector, Manual
Batteries Included?	No
Batteries Required?	No

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