Kettler HKS RX7 Recumbent Exercise Bike Low center step through allows easy access to the seat and backrest Backrest intentionally designed for good comfort and correct posture Convenient bike-brake style release lever enables to adjust preferred position while remaining seated Wireless Polar transmitter for an accurate and fast responding method of heart rate monitoring Residential warranty: 3 year parts and electronics, 1 year labor and lifetime Commercial warranty: 2 year parts and electronics, 1 year labor and lifetime