Our original order lasted us over two years of very hard use.We take them traveling with us in our RV are able to move them outside and even to the beach. Last year we spent five months in Mexico with lots of humidity and sand. One remote controller does work for both speakers, just hit the Auto Tune at each speaker and adjust on/off or volume. We suggest you turn off the main transmitter when not in use, we didn't and might be the cause having to replace after two years.Enjoy