Features:_x005f_x005f Wireless Heartbeat signal transmitted from chest band frequency at AM5.3KHz._x005f_x005f Time display with Hour, Minute, Second._x005f_x005f Alarm clock function._x005f_x005f Alarm sounded when heart rate exceeds the upper and lower limit values(60-220)._x005f_x005f Timing (max. time-keeping is 23 hour, 59 minutes, 59 seconds, 99)._x005f_x005f 12 or 24 hour display format._x005f_x005f Backlight and Noctilucent function._x005f_x005f Keystroke tone._x005f_x005f Waterproof up to 3 meters._x005f_x005f _x005f_x005f s:_x005f_x005f Chest transmitter strap: 66-95cm(Elastic)_x005f_x005f Language: English_x005f_x005f Movement type: Electronic_x005f_x005f Waterproof Depth: 3 meters_x005f_x005f Close Hooks: Buckle_x005f_x005f Case Shape: Round_x005f_x005f Function: Alarm Clock, Heart Rate Tracker,24 hour instruction, World Time, etc._x005f_x005f _x005f_x005f Specifications:_x005f_x005f Material: rubber strap, steel case_x005f_x005f Color: black_x005f_x005f Total size:24522mm_x005f_x005f Dial size:4116mm_x005f_x005f _x005f_x005f Packing Included:_x005f_x005f 1 x Watch_x005f_x005f 1 x English manual_x005f_x005f 1 x Chest transmitter strap _x005f_x005f _x005f_x005f Notes:_x005f_x005f 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_x005f 2.Please allow slight deviation for the measurement data.