Thank you. The device is wonderful. On the finger does not press. Works from 2 finger (3A) batteries. I highly recommend the seller. Contact, contact. Everything suits me. well packed. When you change the position of the hand, the display is adjusted. 5 Star.
Everything works fine, the quality is good. I ordered two pieces, with synchronous measurement the readings coincide. Comes with a convenient case, strap and instruction. Only the battery compartment strains. The spring in one of the cells is installed where there should be a plus, not a minus. So when installing batteries, you need to look at the pictograms themselves.
I bought this for my dad who suffers from an unfortunate series of breathing and oxygen related problems, and his doctor wants him to monitor his oxygen levels at home after a recent stay in the hospital. I bought this one for him because of the price, customer reviews, and design. It definitely does not disappoint! Easy access to check his oxygen at any time. I am glad I went with this product!