Are those actually Xiaomi? I know the listing title says it is, but I don't see that anywhere else. I ordered one from Amazon a while back and had mixed luck: Konke motion sensor
They do seem to behave a bit like the Xiaomi sensor in that they only send "motion active" messages, but unlike the Xiaomi sensors, faking "inactive" with a timeout doesn't seem to work since they don't keep reporting activity if motion remains active--they just don't do anything at all. I could be missing something (maybe there's a configuration it needs sent that I didn't do, or some say it only is able to receive these at certain times).
Also, as I noted above, I couldn't get it to pair on channel 19. Google tells me 15, 20, and 25 are the ones that work (and 20 does for me). I ended up putting mine outside at a place I normally just walk by once (to solve the first problem) to have a light turn on and don't care if it gets eaten by the elements (which would solve the remaining problems 
).
