Put your performance to the test and push yourself to the next level with the RS300X SD heart rate monitor and training watch from Polar USA. Ideal for recreational athletes in need of all vital heart rate and timing features. Training Features: Helps you train at the right intensity with built-in Sport Zones. Fitness Test measures your aerobic fitness at rest and shows your progress. OwnCal feature displays calories burned. Auto Lapping feature automatically records laps based on distance (i.e.: every 1 m/1km). Display Zoom allows you to zoom in on the display during training. Graphical Target Zone Indicator shows the zone you're in, helping you to stay at your desired intensity. HeartTouch - When activated, information can be displayed hands free by bringing watch close to transmitter. Interval Trainer Guided Workouts - Create workouts based on time, heart rate, speed/pace or distance. Records up to 99 laps. Time and distance based interval timers help to alert you when to switch from a higher to lower intensity period or vice versa. ZoneLock allows you to lock into a certain intensity. ZonePointer appears when you are inside the pre-set target zone. Accurate running speed/pace, distance and total distance in miles and kilometers. Backlight makes display easy to read in low light. Date and weekday. Text displays in English, German, French and Spanish. KeyLock prevents buttons from accidentally being pressed during training. Time of day (12/24h) with alarm and snooze. Data Transfer: Compatible with Mac (intel-based) or PC via Polar FlowLink. Compatible with polarpersonaltrainer.com via Polar FlowLink. Compatible Accessories: S1 foot pod. G1 GPS sensor. FlowLink. Includes RS300X training computer, comfortable fabric strap, coded WearLink+ transmitter, and S1 foot pod. Buckle closure. Water resistant up to 50m. Case Height: 37 mm Case Width: 31 mm Case Depth: 14 mm Band Width: 1 in Band Circumference/Length: 9 in