It's great, I bought it for my mother because there are two practical options. A indicates whether the bracelet is well positioned and another to indicate whether the arm is at the right height (in front of the heart). Unfortunately these pictograms are not very visible to the elderly with poor eyesight and so these options are useless, I should have taken him the model below. The ideal would have been that he did not take the tension until the arm is not at the right height or the strap is not tight, it takes still with risk of error, therefore.
