The Spirit Wireless Chest Strap allows for accurate heart rate monitoring to accompany your Sole Fitness product.or as a replacement to an included one. The Chest Strap is compatible with: Sole Fitness E20 Cross Trainer Sole Fitness E98 Cross Trainer Sole Fitness LCB Upright Bike Sole Fitness LCR Recumbent Bike Sole Fitness TT8 Platform Treadmill Sole Fitness SB700 Indoor Cycle