pat7874 My unit is not generating any noise and working great . If humming I would suspect an internal device not glued or unscrewed .

pat7874 These antennas are 2.4ghz yagi, should work on mavic mini when frequency is manually selected on a 2.4ghz channel ! For Mavic air and pro if they are working on 5ghz wifi then it is not compatible !

pat7874 The Chinese manufacturers created and are maintaining a big misunderstanding with that "5g wifi" !!!!! That 5G means wifi 5ghz, this as nothing to do with the 5G phone network; your phone can be 3G or 4G or 5G (G means here Generation) IT DOESN'T MATTER ! To work with a so called "wifi 5G" quadcopter the phone must be wifi 5ghz compatible, many "old" phones are only 2.4ghz so better to check before buying the quad ...

pat7874 As far I understood it would be for farsighted (need glasses for reading); in the file of comments one said that we need it for people having a prescription of 2.0 and above (the EV800DM can adjust the focus up to may be 2.0 but not above) .We need confirmation of that .

pat7874 I have the same question, and the answer " it depends of the pressure" does not help at all : of course it depends of the pressure, and this is precisely the question, what is that pressure ?! According to forums feedback it seems that the pump is quite weak, the system works fine if all is about at the same level, I doubt it can raise the water at 8 feet, may be if there is only one pot ? it "depends of the pressure", the information we dont have !