The Polar RS300X Sports Watch is for recreational athletes who require all essential heart rate and timing features. Included is the Polar H1 heart rate sensor; compatible with S1 foot pod and G1 GPS Sensor for speed and distance measurement. The watch has smart coaching features that include a Fitness Test-tells you exactly how your fitness is developing, Training Load-shows how your training affects your body, OwnZone-guides you to train at the right intensity, and Smart Calories-lets you know exactly how many calories you've burned. The RS300X provides accurate heart rate, calories burned, auto lap recording and stores your last 16 training sessions. Compatible with PC, Mac, and polarpersonaltrainer.com via Polar FlowLink. The watch has a backlight, date and weekday indicator, dual time zone, button lock, low battery indicator, time of day with alarm and snooze, and is water resistant-50m. In the box: Polar RS300X training computer, Polar H1 heart rate sensor, and a getting started guide.