Kinetic Wireless Power Computer is designed to give you accurate power (watt) readings when using a Kinetic Trainer. * All other cyclo computer functions (speed, distance, cadence, calorie burn, etc.) are accurate both on and off the trainer * Heart rate monitor built into the Power Computer. Chest strap included. * Comes with computer, stem/handlebar mount, speed transmitter w/magnet (wireless), cadence transmitter w/magnet (wired), battery, Cable Ties, and chest strap (heart rate monitor). * Watts reading is calibrated on the following mathematical equation:P = (5.244820) * S + (0.01968) * S3 where S=speed and P=power