SereneLife Foldable Digital Treadmill

First, I bought this and it arrived at my house shattered in pieces like the box had exploded. What a nightmare getting a return scheduled for this thing, which I had to lug in pieces into my house in the pouring rain while I waited the few days it took to get a pickup for the return. But, amazon is awesome and they made it as easy as they could. I was still so set on this particular one, that I went ahead and ordered a new one. Second one also arrived with a banged up box and with lots of plastic pieces broken. But this time, it still functioned, thank goodness. Now the machine. Whoever engineered this should think about a career change. There is no Bluetooth as advertised, instead there is an mp3 jack. See image. There is a start/ stop button on the hand rest, exactly where you would happen to rest a hand which SUCKS to accidentally press while you’re in the middle of a run and it is extremely easy to accidentally do! See image. Also, the two hand rests are strangely narrow and an I've never had a problem with whacking my hands/ arms on any other treadmill but I have that issue here. The pulse rate doesn’t work... every time I use it, it bounces from 79-82 while my apple watch shows 160. That’s not just a little off. Also, it sounds like it’s going to break when I run in it. I’ve tried to ensure all is level and nothing is loose, but it sounds like it’s going to snap with every step I take (reassuring, eh?) Otherwise the speed and elevation work, but I’m not sure how accurate they are. They seem ok.