The M61 features the WearLink™ Coded transmitter made from a soft, fabric material. The electrodes, which pick up the heart signals, are integrated right into the strap for added flexibility and comfort. The Coded feature eliminates interference from other heart rate monitors. OwnIndex™ will determine your fitness level, track your improvements, and provide motivation. The OwnCal™ feature counts the calories and fat that you burn and the new OwnZone™ feature will automatically determine each day’s target zone. The M61 is a must for the individual seeking guidance and motivating feedback.