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Hi! I have an ET73 and I just started using it. I found it to possibly be defective because it only has a range of 10 feet line of sight. Through my glass sliding door the range was closer to 7 feet. I have authorization to send it back. I can't believe that this is how it is supposed to operate. I did also get an ET732 as a gift but did not receive it yet due to the backorder situation. Check YouTube for a video of the 732. It's range claim of 300ft is accurate according to this video on YouTube where it was tested.