Waterproof pulse wireless polar heart rate monitor watch with digital cardio sensor for fitness, sports, and running. Features wireless reception of heartbeat signals from chest strap, with a transmission frequency of AM5.3KHz. Displays time in hours, minutes, and seconds. Includes alarm clock function and audible alerts when heart rate exceeds user-defined upper and lower limits (adjustable between 60-220 BPM). Stopwatch function with a maximum timing capacity of 23 hours, 59 minutes, 59 seconds, and 99 fractions. Supports both 12-hour and 24-hour display formats. Equipped with EL backlight and button tone. Waterproof up to 50 meters; do not press buttons while underwater. Package includes: 1 x Watch (battery included), 1 x Chest Strap (battery included), 1 x English instruction manual.