how long do they last prior to installation?
2036711
Each 'Block' is good for 30 days..., which it states on the package and packet. They work great.
2036712
Not really sure but I think they are good as long as the cover strip is intact. After that, the manufacturer says to replace after 2 months. Since they are sold in multi packs, they should be good for a while. Call manufacturer for definite answer.
2036713
The individual briks are sealed with an aluminum barrier, which is not removed until you install them. Each brik lasts two months. They come in packs of three. I usually buy two packs at a time, so they are all used up in year, give or take. Within that time frame, I have seen nothing to indicate the briks are not fully functional for at least that long. Sorry for the long answer, but expiration dates are not provided by the manufacturer, so I gave you the info toonder for yourself.
762465
I have 2... They last about 4-6 months it seems like, depending on how much activity they transmit. The sensor on your front door is going to use more power than a side door. Just my experience.
1390286
They last pretty long. Make sure you use quality batteries, like Duracell or Energizer. Don't forget to turn them off when not in use. I don't want to attempt to guesstimate how many hours, but we really don't have to change them often. If they start making funny noises, time to change batteries.
458365
Mine lasted about five years, but they went bad because I accidentally stepped on the wire and pulled really hard, if you take good care of them they should last at least ten years imo.
198265
Wow, it's been quite a while since I bought them but as best I can remember, 2. It should tell you someplace in the description. They worked fine for me and are still installed. I hope that helps you.
2224805
YOU CAN THEORETICALLY leave them on 24/7 for ten years and they will not only last but never downgrade...I could go into scientific data about it but it'd better if you go online and read because it is a very long date article...u have some very very very ofl old on my refugium that's been on all day everyday and they are as bright as the day I built then....
709176
Hard to tell but depends a lot on the ventilation. If open to the air it should last its full claimed life. If totally enclosed then it will probably overheat and fail early. Really it all depends on the installation
469154
I believe they are supposed to last for one year. I have been using mine for over 6 months now and it has barely changed in size.
1021311
I'm not sure. I only installed mine a little bit ago so I can't speak to their longevity. I'd try calling their customer service department to check with them: 800-821-3944
426403
No, I have not. And so far, I have not had any problems with them lasting for weeks and even several months.
950683
Don't know, I haven't had to replace them. But it's my understanding they last or thousands of hours.
1378130
As far as I can tell, I got these 25 May 2013. I posted my review 27 June 2013, and if memory serves, I installed two of the color cartridges not long before that, so at the time of installation I had probably had them about a month. I have no complaints. I would assume since they sell quite a few in a package, they don't expect them to dry up very quickly, and I believe I saw that they come with a 1-year guarantee. Hope this helps.
1209401
The ones I have received in two separate orders were for four years before the "Best Before" date. If you are planning to put into service within three years or so, that should not be a problem. I use them in a shorter time frame than four years.
929069
For me , they last about 4 months. I use them in a home repair business but must add that I do not use them everyday.
1699405
They will last years, I have one installed for 6 months now and no problem at all,
1201116
I haven't had that problem. I have two of them installed for 2 1/2 months and no problem.
346376
I have used them about 5 hours a week and it has been 2 years and 9 months; they are still working. Just remember when installing them wear gloves.