Compatibility or modular system. What does this actually mean?  You can simply pair any indicator with any receiver.

With us, everyone can put together their own fishing indicator set with a receiver anytime, any way and regardless of the model series. For example, if you combine carp fishing with catfish fishing during the fishing season, you can add a catfish alarm to your existing carp indicator set and pair it with your receiver. Or you start going fishing with your son, who would like his own indicator. For one rod you buy him an e3TX indicator, which you pair with your receiver and you can fish together. In a year or two you can add a Neon or Q9 to it and it will still work with your original receiver. This is our modular system that works on the compatibility between products.