why do smoke detectors have leds?
1677919
They have LEDs that flash every 90 seconds to let you know the unit is receiving power but they start to beep (chirp) every minute or so when the battery is low & needs to be replaced
1677920
I think they only flash when you're low on battery. These things are pretty small. I like them.
1677921
they use very little energy so not to drain the battery and led lights last for a very long time.
1677922
I think they have LEDs so you see at a quick glance if they are working. Mine has a very short flash every 10 seconds or so.
481107
I have five smoke detectors, they are all photoelectric. The product does work. On the bottom of the can there is a note: Excessive spraying may effect the detector's sensitivity. Another note on the can, for use with smoke alarms listed to UL standards 217 and 268. I read the previous answer, my previous smoke detectors stated they should be replaced every 10 years which I did. My current smoke detectors have the same note, they are all connected to my alarm system.
1008166
Yes. My "smoke only" detectors are connected to my "smoke + carbon monoxide" detectors.
481110
I have five smoke detectors, they are all photoelectric. The product does work. On the bottom of the can there is a note: Excessive spraying may effect the detector's sensitivity.Another note on the can, for use with smoke alarms listed to UL standards 217 and 268.I read the previous answer, my previous smoke detectors stated they should be replaced every 10 years which I did. My current smoke detectors have the same note, they are all connected to my alarm system.
47909
They are infrared leds they are hard to see if they are on . Turn camera on and look at it with it cuped in your hand or in a dark room you should see. Them faintly glowing if your wiring is correct
580315
yes,it has a flashing led, green and blue ,but they are not bright and very tiny,you could turn the unit around so it does not face you or you could cover it.
1628697
I have four of them installed in my apt bldg stairwell. They have a motion detector function and a day/nite/other lite source detector. I have the day/nite function off so they light 24/7 on motion. Some spots in the stairs are a little dark even in daytime. They are not the brightest light but do for my purposes.
1716357
Smoke Alarm side is photoelectric only. To have the ionization detection, you must purchase an additional alarm. Keep in mind that there is a maximum number of alarms that can be connected together.
534710
To answer your question the smoke detector does use 9 volts to power it, but it is done through (3) AAA E92 batteries and not the conventional square 9 volt you are thinking about. I am not certain about the smoke detector portion using photoelectric technology, I could not find any reference to that, however the heat and freeze sensor portion uses thermistor technology to detect. Just an FYI the detector can identify tampering and low battery conditions and when programming it you need to have each sensor entered on the main alarm panel as a separate sensor. this is 3 in one.
409283
Yes, that's largely the point of motion sensors. :-) They operate in the infrared spectrum, so visible light is not necessary. They're often used to turn on lights when motion is sensed, which is what I do with mine.
186071
I think the rationale behind the spec is based on the heat of a 25 watt incandescent, not its lumens output. The LED's are extremely cool in operation. The incandescent, on the other hand, converts a very high proportion of electricity to heat instead of lumens, which is why it burns so many more watts and gets untouchably hot.
1159970
i'm working out of town at the momemt and don't recall, the LED lights are hard to see. mine woirks consistent with the instruction/scheme printed on the device. hopes this helps
1867007
It has light; no smoke.Some might say why would you need a light if you don't smoke!
2201018
Looks like its designed to imitate infrared emitters. These are used to enhance nightvision in cameras, and you can definitely see it in cameras that have it. The brighter the light, the more the camera can see in pitch dark.
144114
The unit has a battery in case you lose electric power, but they are also connected to your house's electric wiring so the battery doesn't need to be replaced so often. In addition, when one smoke alarm goes off, all the smoke alarms in the house go off. This is important as I have a smoke alarm in the basement that I might not hear from some of the bedrooms if they all didn't go off together.
2151194
It has two small LEDs on top of the unit when it is recording, IIRC. One might flash. Easily covered with tape to hide them. I returned mine because the battery mode was useless and quality poor, but probably reasonable for the cost.
1868884
The blue LED light lets crooks know you have an alarm system. The system can be wired to actuate the door system with the fob hence keyless entry