Waterproof Pulse Wireless polar heart rate monitor watch Digital cardio sensor Fitness sport Running hrm Heart Rate Chest Strap Features: Wireless receiving heartbeat signal transmitted from heartbeat brooch,chest band frequency is AM5.3KHz; Time display: hours, minute, second; Alarm clock function; Give alarm shen heart rate exceeds the upper and lower limit values (60-220); Timing (maximum time-keeping is 23 hours, 59 minutes, 59 seconds, 99); 12/24 hour display format; EL backlight; Keystoke tone Waterproof: 50m Waterproof (please not press watch button under water.) Package Inlcuded: 1 x Watch(Battery included) 1 x Chest Strap(Battery included) 1 x English Instruction