*This heart rate monitor is not a medical device. Always consult a physician before starting an exercise program. If you have a pacemaker or other implanted electronic device, consult your doctor before using this product. The use of this product while exercising might distract you from your surroundings or your activity. Interference with the signal from external sources, poor contact with your wrist and other factors may prevent accurate heart rate data readings or transmissions. TomTom disclaims all liability arising from any such inaccuracies.