Bowflex Fitpack Connect Displays heart rate continuously on smartphone while to connected to other applications. Measures heart rate signal at a distance of up to 0.8 meters. The 3.5mm headphone jack provides both music and heart rate simultaneously. Compatible with iPhone (4, 4S, 5), iPad (1, 2, 3), Android tablets and most smartphones. Kit includes a chest belt with "Comfort Strap Technology" compatible with most treadmills and other exercise equipment.