Features:_x005F_x000D_ Wireless Heartbeat signal transmitted from chest band frequency at AM5.3KHz._x005F_x000D_ Time display with Hour, Minute, Second._x005F_x000D_ Alarm clock function._x005F_x000D_ Alarm sounded when heart rate exceeds the upper and lower limit values(60-220)._x005F_x000D_ Timing (max. time-keeping is 23 hour, 59 minutes, 59 seconds, 99)._x005F_x000D_ 12 or 24 hour display format._x005F_x000D_ Backlight and Noctilucent function._x005F_x000D_ Keystroke tone._x005F_x000D_ Waterproof up to 3 meters._x005F_x000D_ _x005F_x000D_ s:_x005F_x000D_ Chest transmitter strap: 66-95cm(Elastic)_x005F_x000D_ Language: English_x005F_x000D_ Movement type: Electronic_x005F_x000D_ Waterproof Depth: 3 meters_x005F_x000D_ Close Hooks: Buckle_x005F_x000D_ Case Shape: Round_x005F_x000D_ Function: Alarm Clock, Heart Rate Tracker,24 hour instruction, World Time, etc._x005F_x000D_ _x005F_x000D_ Specifications:_x005F_x000D_ Material: rubber strap, steel case_x005F_x000D_ Color: black_x005F_x000D_ Total size:245*22mm_x005F_x000D_ Dial size:41*16mm_x005F_x000D_ _x005F_x000D_ Packing Included:_x005F_x000D_ 1 x Watch_x005F_x000D_ 1 x English manual_x005F_x000D_ 1 x Chest transmitter strap _x005F_x000D_ _x005F_x000D_ Notes:_x005F_x000D_ 1.The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness._x005F_x000D_ 2.Please allow slight deviation for the measurement data.