Heart Rate:, Working range 30 to 240bpm, ECG accurate hart rate, Target zone settable in 1bpm increments, Audible and visual heart rate zone alarms, % Max/Heart Rate display, Calorie counter, Altimeter:, Working range –2,305 to 30,045ft (-702m to 9158m), Current, Accumulated and Maximum altitude in ft or m, Altitude resolution 3ft (1m), Graphic altitude trend display, Altitude alarm, Stores 20 altimeter data/readings with altitude, time, and date, Barometer:, Sea level pressure and absolute pressure displays in mbar and inHg, Resolution 1mbar (0.05inHg) working range 300mbar to 1100mbar (8.16inHg to 32.4inHg), 24 hour graphic barometer pressure trend display, Barometer/Temp display, 6 hour weather forecast feature, Thermometer:, Resolution 0.1 in F and C, Working range +14 F to +122 F (-10 C to +50 C) , Watch:, Time/Day/Date/Month with Dul Time Zone, 12 or 24 hour format, Time/Temp display, Dual daily alarm, Hourly chime, Chrono:, Resolution 1/100 second with maximum time range 24hr 00min 00sec, EL Backlight system, Water resistant 30m, 2.5oz (70.9g), Heart rate transmitter: Consumer serviceable battery (1CR2032)