Daily alarm when heart rate go beyond the user preset upper heart rate limite. (default 160bpm) * Heart rate monitor with cordless transmission between watch and chest belt, Measures and displays resting heart rate * By CE or ROSH certification standards * Water resistant to 30 meters * There are 3 colors of the watchband, Black and Silver. Pls kindly tell us which color you prefer before making orders, or we will send randomly, thanks for your supporting! We promise the best price and quality for all our customers!