Timex T5K628F5 Midsize Digital Zone Trainer Heart Rate Monitor Watch Digital heart rate monitor lets fitness enthusiasts track goals and progress over time; "In-Zone" graphic display helps you train at right intensity Comes complete with comfortable Timex Digital Heart Rate Sensor with adjustable strap and user-replaceable battery Heart rate displayed as beats per minute (BPM) or percentage of max; average heart rate for your workout and each lap; time in zone spent within one of six selected heart rate zones 100-hour chronograph with lap or split; 27-lap memory with average heart rate per lap, 100-hour countdown timer, and alarm with five-minute backup; water-resistant to 30-meters Includes limited one-year manufacturer's warranty