I bought this product last year. Upon receipt, I installed the product and it worked for a day. I sent it back and got a replacement. I installed a new one and it worked for a couple of weeks until the cool weather came and it wasn't needed. In March of this year 2020, while preparing our greenhouse for the coming spring, I tested the device - it did not work. The batteries and remote transmitter worked fine, but the receiver, which turns on the fans and monitors the temperature, didn't work. The product is useless for me. I also bought another remote control for my greenhouse heaters early last year. They still work perfectly. I used one of these devices to control my fans as this product didn't work. My old blocks work fine.
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