https://www.amazon.com/AP-Products-0...51336139&psc=1
These are what you are looking for. Work well. They are available other places, I bought them from Amazon for ease of return, etc. if issues.
Note - they ship in manufacturer mode, you will need to press "link" button on them 6 times to get them out of that mode. Otherwise they will pair, but then will go to sleep and quit reading. Contacted BMPro and they were very helpful with that solution, just saving you the step. Directions are non-existent with the package.