... wireless receiving heartbeat signal. 2.Watch: Hour, Minute ann Second display. 3.Alarm clock function. Wireless receiving heartbeat signal transmitted from ... heartbeat brooch, chest band frequency is AM5.3KHz; Time display: Hour, Minute, Second;Alarm clock function;Give alarm when ... lower limit values (60~220).Timing (maximum time-keeping is 23 hours, 59mimutes, 59 seconds, 99)12/24 hour displaying ...