I sent this back because the propeller guards did not fit. These, IMHO, are essential if children, pets etc are nearby. I was extremely surprised by the response from HAOXIN who emailed me (via Amazon) that the guard design had changed and asked if HAOXIN could send me this new design. I found the Customer Service from HAOXIN to be excellent. They took it upon themselves to offer a solution, without pressure or argument from me, the consumer, to do so. I highly recommend this product and the company.