Heart Rate Monitoring: Lifepulse™ digital heart rate monitoring hand sensors are conveniently placed on the side handlebars to provide precise heart rate monitoring, and Polar® telemetry provides accurate, “hands-free” heart rate monitoring. (Telemetry requires optional chest strap.)Motivating Workout Variety: Zone Training+™ Workouts automatically adjust the resistance level to keep users in their target heart rate zone. Also includes goal-based workouts, Fitness Test protocols, and the machine-prompting Aerobics Trainer Workout to keep users motivated.Self-Powered Convenience: Cordless, so you can place your bikes anywhere in your facility. (Models with optional Attachable TV System require power.)Reliable Belt-Drive System: Custom-designed system is quiet and virtually maintenance free.Plug-In Option: Provides a lower operating resistance, which appeals to novice and deconditioned users.DVD/CD/iPod/Laptop Compatibility: Connect an iPod or DVD/CD player or laptop directly into the Attachable TV (requires additional external cord not supplied by Life Fitness).Comfort and Convenience: Ergonomic contour-molded back support and seat with built in grooves keep exercisers cool and dry, and proper left-right weight distribution helps prevent muscle fatigue.