This wireless heart rate monitor watch displays your heartbeat data transmitted from the chest belt via wireless transmission could see the up and down trend. Very impressive backlight for night runs. Good for anyone who jogs bicycles runs on treadmill or any sport or activity. - Heart rate monitor with cordless transmission between watch and chest belt - Time functions: hour minute and second - Selectable 12/24 hour format - Stopwatch function - Daily alarm when heart rates go beyond the user preset upper heart rate limit (default 160 bpm) - Power saving mode - Watch up to 30 meters water resistant - Both watch & chest belt are powered by 1*CR2032 battery (included) - Comes with English instruction manual