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Function and Operation Wearing Wear armband on the upper portion of the forearm. Sensor should be on the inside or top of forearm. It should be worn snug enough not to move onyour arm, but NOT so tight that it restricts arm circulation. Turn-on Press the start-up button, the LED light will flash blue quickly, indicating the heart rate searching. As the heart rate has been detected, the light will flash slowly. Turn-off Press the start-up button when not in use, the LED light will flash red quickly, then enter the shutdown state. Power a. Whenyou press the start-up button, if the LED light flashes red several times. It shows that the battery is low and need to be charged. b. The LED light will flash red and green alternately while charging. After full charge the LED will show green continuously