These traps may last for years. You're more likely to lose the triggers or indicators. Trust me, I do have lost many over the years.
We do recomend you tie a string on your trigger to the trap so you don't lose them. But for those of us who don't like to read instructions. Here we have spare triggers and indicators.
This is the Do it yourself kit. It comes with 25 traps and 40 triggers. This is generally sold to farms, people with large properties or smaller golf courses. If you're interested in buying DIY kit click here.