Features:_x000D_ Wireless Heartbeat signal transmitted from chest band frequency at AM5.3KHz._x000D_ Time display with Hour, Minute, Second._x000D_ Alarm clock function._x000D_ Alarm sounded when heart rate exceeds the upper and lower limit values(60-220)._x000D_ Timing (max. time-keeping is 23 hour, 59 minutes, 59 seconds, 99)._x000D_ 12 or 24 hour display format._x000D_ Backlight and Noctilucent function._x000D_ Keystroke tone._x000D_ Waterproof up to 3 meters._x000D_ _x000D_ s:_x000D_ Chest transmitter strap: 66-95cm(Elastic)_x000D_ Language: English_x000D_ Movement type: Electronic_x000D_ Waterproof Depth: 3 meters_x000D_ Close Hooks: Buckle_x000D_ Case Shape: Round_x000D_ Function: Alarm Clock, Heart Rate Tracker,24 hour instruction, World Time, etc._x000D_ _x000D_ Specifications:_x000D_ Material: rubber strap, steel case_x000D_ Color: black_x000D_ Total size:245*22mm_x000D_ Dial size:41*16mm_x000D_ _x000D_ Packing Included:_x000D_ 1 x Watch_x000D_ 1 x English manual_x000D_ 1 x Chest transmitter strap _x000D_ _x000D_ Notes:_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._x000D_ 2.Please allow slight deviation for the measurement data.