Update July 18: I've started wearing the 45 to sleep. That really shows REM. He does not offer an impulse bull. 45s works great with my Scosche Rhythm+ heart rate monitor. As usual with wrist heart rate monitors, I have to lift 45 kilograms higher on my arm and put some strain on them during the workout when swinging my arms. It's easier for me to use Rhythm+ during class because I already have it. The 2.60 firmware update did not fix the notification issue I reported in my original review, but