How often they have to be replaced by the new ones?
1120305
Immediately, apparently. Only 3 out of the six I bought even worked from the beginning and now a few months later only 2 work.
1120306
My best guess is.. unless it breaks, it should just keep ticking. However, how well these work is a big question.
1120307
to my knowledge they are good for a couple of years. they use next to no power and the ultrasonic noise they make is steady as long as the light (red flashing) is blinking. sometimes it may take a little while to convince your pests that they had best leave if they didn't want to go crazy listening to an sound only they can hear. i was amazed to see that these units did such a good job at driving off ants. we have them by the millions out here but never anywhaere close to one of these repellers. hope that answred your question.
1885868
Yes! I don't know their longevity? If it comes time to replace one , I'm sure you will see "tell-tale " signs that it's appearance has changed enough to warrant replacement. I don't use them on a daily basis, just 2-3 times a week. I personally feel they are excellent. Compare them to others, watch " U-Tube", you will get the idea quickly.
310211
It depends on the usage. I use my when I travel, which is about a dozen times a year for about a week each time and they have lasted for years.
938389
I have been using them for 2 years. if you use them twice a day they will last 30 days. You than need to replace them. I don believe it is permanent, you will have to continue on a maintenance program I sometimes forget, but most of time I use them at least once a day I hope this helps by iluvmath65@yahoo.com
1057596
It all depends on how much you use them, but for me i use them everyday with high dust content so I replace them every few months
1718248
There is a cartridge that can be replaced, I don't know how often it needs to be done! I haven't had mine long enough!
341013
I am not sure. I have only recently started replacing ones at the business that I work at.
2254999
They are a little flimsy so I replace when they crack. (around every three weeks, give or take.)
2157235
They will fall off before they grow off. You will replace one or two a week as they fall off
128670
They do not appear to be replaceable. Mine show little wear from pushing of logs and shore. The plastic is pretty tough.
2195242
I change mine every 6 months. I have pets. You may be able to go longer if you don't have pets.
783348
I use one about every 2 weeks. If you keep them clean they last a long time
1733238
I have been using mine regularly once per week for a couple of months and don't foresee a need to replace them but maybe after a year or so who knows? If I boiled them too long accidentally then maybe that could ruin them and they would need replacing.
298840
I don't remember the last time I replaced one, so I'd guess at least one year.
1263918
I do not think so. It is suggested to change them once a year. It had been about 5 years before I purchased news ones. I just keep cleaning them till they where not cleanable anymore
253432
I've been changing mine every two months. Honestly not sure how often they are supposed to be changed.
2132746
I don't know, I haven't had to replace them yet,but I would think you could replace them with ease.