With the OH1+ Optical Heart Rate Sensor with Swim Goggle Clip from Polar, you can keep tabs on your heart rate while you work out on land or in the water, with a watch or phone, or without. When on land, just clip the OH1 to the included armband and wear it around your upper or lower arm. The data collected can help you better maintain a steady, rhythmic pace while exercising. That data can be wirelessly transmitted to be displayed and stored in an app, such as Polar Beat, or on the display of a fitness device.
The inclusion of a swim goggle clip means that you can more easily transition from a land-based activity, like running, to the pool for some laps. Just pop the OH1 heart rate sensor in the clip and attach it to your goggles next to your temple. The OH1 is water-resistant up to 98.4'. If you want to go device-free, the OH1 features enough memory to store 200 hours of data you can later sync and analyze.