WEGO Enduro 300 Heart Rate Monitor With Optical Heart Rate Technology, Includes USB Rechargeable Battery and Charger Optical heart RATE technology - no chest strap required Custom user profile, up to 5 daily alarms, dual time zone, date, night mode USB rechargeable battery and Charger included Time-alarm-chronograph (stopwatch)-heart RATE. Heart RATE zone, percent max heart RATE, calorie burn