Relatively expensive. I found reception to be spotty, and then the EZSnsRF failed, rendering the Dakota transmitters useless. The other problem is that when the contact closes, the transmitter only sends one unacknowledged signal. Given spotty reception, the flood could be missed. I instead am using a TriggerLinks with a simplehomenet EZsnsLQD flood detector the same one supplied with the EZLqd. The triggerlink suffers from the same single event problem. Where an outlet is avaliable, I use an IOlink with the EZSnsLQD, as they can be polled repeatedly.