forerunner 50 with heart rate monitor waterproofipx7 (20 meters) can be used indoors or outdoors multi-sport capabilities transmits workouts to a pc with the included usb ant receiver always on feature enables easy, wireless downloading of workout data analyze workouts with garmin training center or www.garminconnect.com compatible with gsc 10 speed/cadence sensormonitor pedaling cadence & wheel speed memory capacity up to 100 laps or exercise sessions for 7 hours interval training zone training available for running speed/pace, bike speed/cadence & heart rate comfortable vinyl wristband easy-to-read display battery life: 12 months (coin cell battery) distance accuracy: 97% typical without calibration/ 99% after calibration watch functions: time of day (12/24h), dual time zone, calendar (day/date) & daily alarm weight: 1.5 ounces 2.05"h x 1.69"w x .55"d