Q. How many hand held remote control do I need ?

A. You probably just need one, you can according to your requirement to choice single channel or multi channel
remote control. the remote control's emission frequency : 433.90 MHz ,emission distance : 200m outdoor and 35m indoor,so we advise if your house is quite large 2 storied house and have many rooms,it's better use two remote control ( emitter) which you can use one for each lever, or more remote control for your convenience if you prefer.

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