https://www.amazon.com/Wellue-Fingertip-Saturation-Batteries-Bluetooth/dp/B0881PTQH4/ref=mp_s_a_1_6?dchild=1&keywords=pulse+ox+bluetooth+wellue&qid=1630729044&sr=8-6 This is the one I have. The only caveat is you need to have the app open while recording data. The app will give you a data report and that will be saved in the app(not the pulse ox). It shows you OSAT trends and HR on a graph kind of like a sleep study would, as well as average and lowest. Also you need to tape it to your finger pretty good or it'll fall off. I think it's a good option to save money if you're only going to use it a few times to see if you have sleep apnea