The Myzone MZ-60 Watch watch pairs directly with your Myzone MZ-3 Heart Rate Monitor to display your Heart Rate, intensity level, Myzone Effort Points (MEPs) and calories. This perfect companion to your MZ-3, provides convenient real time feedback during your workout, helping you to hit your goals and stay motivated. The Myzone watch does not detect Heart Rate without an MZ-3 Physical Activity Belt. Features Displays real time data from your Myzone Physical Activity Belt. Shows digital time and date. Stop watch/ count down timer/ alarm/ interval timer. Perfect training partner for when you can,t carry your smartphone. Displays Heart Rate/ MEPs/ Calories/ Intensity level. Available in two sizes: 40mm and 44mm. Water Resistant. 1 year warranty. Compatibility This watch is ONLY compatible with an Myzone MZ-3 Heart Rate Monitor.