Heart sensors work best with a full charge. Connect the sensor to the charger and charge for 1 hour before you play. To charge, line up the dots and attach the heart sensor to the charging base. If you feel like you are forcing the heart sensor into the charger, you may have it turned the wrong way. When attaching the charging base to the sensor, you should hear a click, and notice that it attaches firmly.
Tip! You might also want to charge the heart sensor immediately after playing so that it will be ready to go the next time you need it.
