XOSS X2 Heart Rate Monitor Bluetooth & ANT+ The device support Bluetooth & ANT+ operation. It can be connected with your app or your bike computer. It is so convenient when using. More Accurate The design of our product is much more accurate and precise than traditional optical heart rate sensor. The principle of our product is utilized by the micro-voltage signal generated by the regular body heart beat, and amplifies the signal to directly compute out the heart rate value. Long Battery Life and Low Power Consumption CR2032 Lithium button cell It will last up to 1 year. (The above conclusion is based on the exercise time of 5 hours per week and 1 hour each time) IP67 Waterproof IP67 Waterproof and Dustproof Enjoy your cycling every day under different weather conditions. More scientific and effective exercise Through heart rate recording and our product can synchronize with other devices like PC, tablets, can give full observed variations of your heart rate changes and adjust exercise intensity and so on. 80%Nylon and 20% Spandex Replaceable Strap Easy to wear, comfortable and adjustable. Safe linen material80% Nylon and 20% Spandex. Packing List