the heart and activity monitors. Eagerly I placed an order, and was surprised that they arrived within 3 days. A terrible coat rack that was too difficult to put up. On the left side of the ear cup, there is an active noise cancelling switch. These are super cute and I was a little unsure, but decided to go for them and boy am I glad I did. Just got mines in the mail like 20 mins ago. Die ( meisten - fast alle ) übrigen Bewertungen bis jetzt sind meines Erachtens wertlos . PERO EL EMPAQUE BIEN EL CELULAR FUNCIONA PERFECTAMENTE ASI QUE CUMPLIO MIS EXPECTATIVAS Chaco has the biggest selection of patterns/prints and may seem expensive, but I have close family members and friends that have had the same pair for 5-10 years and still love them! The instructions are woefully inadequate and although I am pretty adept at this sort of technology this installation was a 6 hour nightmare.