The straps are compatible with each other. I tried the visual beat strap on the display model. The old strap model has no artifacts at all. For the er1-lw holter, I also received the old strap model in the package. Unfortunately, I am very disappointed with the new model. The part with the electrodes is a little stiffer and probably because of this there are problems. My attempt to tighten the strap as much as possible did not have a good result. During sleep there were artifacts and very large pauses. I mention that I have been using these devices since visual beat. I would like to return the product if possible. Thank you