I already have three of them. One for the bedroom fan and two to control a fan in the living room. They are easy to install and only require power and ground (no neutral used). They work like a remote control so you don't have to connect a fan to it at all. But you can, and then a one-time switch is used to completely turn off the power. You can connect them in series to replace the on/off switch. Just turn on one and then the other. You can prevent interference from multiple fans by adjusting the rear panel DIN switches. They then pair with your fan (no adjustment required on the fan side). In the living room I paired two with a fan, as well as the remote control that comes with the fan. So, three ways to control the fan. All work perfectly. You can turn the fan on on one device and off on another. No problem pairing multiple devices with one fan. And they don't accidentally interfere with or control the fan in the bedroom. The only minor annoyance is that there is a blue LED that cannot be turned off. There seems to be different intensities with different switches, so you can get really bright or less bright. It doesn't really bother me but if you had one in the bedroom it would turn out to be one of the brightest. Not perfect.
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