Well I guess Its time I share my chinkswing experience with you bros. I snagged the one in pic related from Ali Baba a few months ago. It's the one reviewed in this video:
https://youtu.be/cfTv8BxR_hQ, same packaging and everything. Like the guy in the video, I had trouble getting mine to work in the beginning. It worked the first time when I put my phone in, but then it stopped registering distance after that first time for some reason. One of the comments under the video suggested putting the phone in upside down. I tried this (and I also have been taking the phone out of its protective case when I swing it), and that did the trick. It has been consistently registering distance since then. My phone is a Samsung galaxy S7. Swinging is totally worth it for the easy weekly rewards and egg hatching.