A. Waterproof Pulse Wireless Polar Heart Rate Monitoring Watch, Digital Heart Rate Sensor, Fitness Exercise Running Heart Rate Monitor, Heart Rate Chest Strap B. Features: - It can wirelessly receive heartbeat signals transmitted from the heart rate chest pin. The chest strap frequency is AM5.3KHz. - It has a time display showing hours, minutes, and seconds. - It has an alarm function. - It can alarm when the heart rate exceeds the upper and lower limit values (60 - 220). - It has a timing function (the maximum timing is 23 hours 59 minutes 59 seconds 99). - It supports 12/24 - hour display format. - It has an EL backlight. - It has a button sound. C. It is waterproof up to 50 meters (do not press the watch buttons underwater). D. Package contents include: - 1 watch (including battery) - 1 chest strap (including battery) - 1 English instruction manual