this is the best one https://www.amazon.com/Polar-Heart-...&qid=1631727932&sprefix=polar+,aps,237&sr=8-3
it connects faster and I find it a lot more accurate then the optical versions. I was using the wahoo tickr but it was having issues. I have not tried the polar on the Kiox as I upgraded since then but I found you had to turn the kiox on first then the HRM so it may be the same with the polar so keep that in mind. now the Nyons are jsut the oppisite they wont conenct unless the Hrm is turned on first.
Kiox supports the following devices: Polar H7 Polar H10 Heart Rate Sensor Runtastic Heart Rate Combo Monitor Wahoo TICKR Heart Rate Monitor BerryKing Heartbeat chest strap or BerryKing HeartRate Sportbeat arm band.
I had a garmin chest and it worked for a few rides on the kiox then not so I had to go to the tickr. I like something on my arm better but they have their own issues. the strap on the tickr comes lose easily I had the optical polar and it was better but it only goes maybe 7 hours. but i noticed that for the first several minutes on my ride it will just stay at where it starts mostly. so chest strap it is. you can save money on the
POLAR H9 Heart Rate Sensor I thin kthe only difference is it will only hook up to one bluetooth device.
I foudn I had to disconect the others from my phone for the nyon to connect to them. but the 10 I can hooked to my phone too.
I have had issues with it. maybe as it gets colder? but the polar chest really does better it responds far faster and will show the rise of my HR the optical ones would take a bit to keep up and get going. that was both the tickr and the polar optical. optical getting long sleeves over them can be a pain too. p0lus charging the polar was a pain too too easy to lose the little adapter plus I had to charge it 2 or three times a week.
ya it did ok but sometimes it would not connect and I had to turn bluetooth on and off or remove it and find it again. but it seem the polar 10 really connects better for the old and new and I can have it connected to my phone too and it costs less now that it is getting cold trying to get long sleeves over the arm ones is more of a pain.
I don't know if my wackiness is normal with the opitcals. but both the tickr and the polar would not really read right by the time I was up the 1 to two block slopes I go up. when the chest one has the steady rise you would expect. it may be not having a perfect position. I tired wearing the tickr on my wrist and it would randomly got to 150 or so when it should be around 90. I would rather wear a rm one it is easier to put on and take off. but hte polar chest has a clip so its easier then when you have to put on over your head like the garmin. when I got the chest hrm I put the polar optical on and had one on my nyon and one on my garmin. though overall the average was about 8bpm the difference in readings and speed was pretty dramatic. I ride in the city so lots of starts and stops. the check hrm keeps up the optical is always slower to keep up with the changes.