The Steel HR is the first activity tracker of its kind, with a heart rate monitor that can offer a long-lasting battery life of 25 days before it needs recharging. It comes with a stylish, classic watch body that compliments your gym outfit as well as your evening wear. The Steel HR has both an analogue dial and digital display, and a soft silicone strap with a traditional metal buckle. It is available in 36mm or 40mm, black or white, with a whole host of alternative straps, including leather, to suit your style.