Platysens Marlin x Polar Optical Heart Rate Sensor
Combining GPS*, Motion Sensors and Voice Technology, Marlin provides realtime audio feedback to swimmers. Important swimming parameters such as lap time, stroke rate and even navigation* information are provided instantly to swimmers without disrupting the swimmers' motion.
Now together with Polar Versity Sense or Polar OH1+, an optical heart rate monitor. You can also hear your realtime heart rate from the Marlin bone conduction headset while you swim. You can listen to your body and perform the most suitable training.