Any difference between this and the "old" 4-pack other than "life expectancy"?
187001
The life expectancy is longer due to the fact that these are sealed ball-bearing fans; they should be more suitable for vertical mounts than the "old" 4-pack. The "old" one is actually a different spec, so not "old," just "different."
19158
So far I can't tell a difference. But I have always been very active before I purchased one. I got one for my Mother and she swears by it. She is 73!
1430591
I believe it's just an older model number. I haven't found anything with any difference between the two of them.
829893
There might be a couple of differences between the products. The only real difference with the product itself would be if it were created before 2004, then it would not include the direct socket connector which is a great improvement we made to our LightKeeper. After adding the socket connector, it became the LightKeeper Pro. The year the LightKeeper Pro was manufactured and sold may vary. However, this does not really make a difference because we offer a life-time guarantee on our product excluding batteries. Whether it is brand new or a few years old, we stand behind our product. The packaging has changed throughout the years. Some of the offers, you will notice, might include spare bulbs. There might be a couple of differences between the products. The only real difference with the product itself would be if it were created before 2004, then it would not include the direct socket connector which is a great improvement we made to our LightKeeper. After adding the socket connector, it became the LightKeeper Pro. The year the LightKeeper Pro was manufactured and sold may vary. However, this does not really make a difference because we offer a life-time guarantee on our product excluding batteries. Whether it is brand new or a few years old, we stand behind our product. The... » Read More There might be a couple of differences between the products. The only real difference with the product itself would be if it were created before 2004, then it would not include the direct socket connector which is a great improvement we made to our LightKeeper. After adding the socket connector, it became the LightKeeper Pro. The year the LightKeeper Pro was manufactured and sold may vary. However, this does not really make a difference because we offer a life-time guarantee on our product excluding batteries. Whether it is brand new or a few years old, we stand behind our product. The packaging has changed throughout the years. Some of the offers, you will notice, might include spare bulbs. « Show Less
1715370
It seems they make both grades of the product....the 35K hours life is ~ $10 cheaper.
264993
You have nothing to worry about with the current, improved version. I talked directly with ThermoWorks about this and learned that they have upgraded the unit's circuitry and are now using a better battery. I have had mine for nearly two years, use it regularly, and have not had to replace the battery yet.
55729
I purchased the 4-pack and they worked fine. While I haven't seen the others, I imagine they are very similar.
686042
Danny,There is not much difference. It is kind of like buying a 2014 explorer or a 2015, they don't change much. My preference would be a series 3 as that would be more of a collectible than a Series 4 given time. Make it A Great Week,Carter
669339
There isn't a difference between the packages except the item count. I've also purchased it in a single count pack.
578185
I have the older version from 2007 & find the batteries last about 2 years. I found I could remove all the screws on the case & unhook the battery pack. I take it to the guys at the "Battery Store" & for $20 they build me a new pack. However I am suspecting that the bulbs are finally getting weaker, as my depression is not responding as well as it used to. I am planning to buy a new unit after 8 life saving years.
763488
I could not find any difference, even researching on the web. The only other thing I could suggest is calling or emailing the company.
1932290
From information obtained online, it appears to be a direct replacement. It is a better unit since it has dual sensing. It should also be noted that if additional units are over ten years old, their effectiveness is reported to be diminished to the point that those units should be replaced
580931
I bought the 4-pack and at the bottom left it says "9x longer" There was no claim for holding a charge for 20 years.
1317011
Hi, not sure what the difference is exactly, but I must admit that I find this one much better than the previous one. It is lighter and more durable so I fully recommend getting 83 slow. Sorry I can't be more of help
2132922
I can't say for sure what the life expectancy of the packs are, but we've had them in our bedroom closet for over a year and they seem as good as the day we bought them. They are big enough for small closet use. For larger areas, such as sunroom area, we use the recyclable/reusable boxes. Hope this helps.
427103
Since they're sealed in separate packs, I doubt if their efficacy has been diminished regardless of how old they are. I'd recommend that you go ahead and use them, and I bet they'll be very effective. Mine certainly have been.
2204190
U429085 is better quality and thicker. It is also more expensive. The difference is not really noticeable to me as I've bought both. But some reviewers note there is less humidity with food staying good longer.