New, unopened box, factory sealed. Track heart rate,skin temperature, sleeping position and quality. Long Range model: Switched to new optical heart rate sensor hardware. The new state-of-the-art optical sensor provides the best signal-to-noise ratio and results in higher accuracy and quicker response of heart rate reading. New sensor shape and size. The sensor has been slightly enlarged. Now the sensor is no more a small part or chock hazard according to Federal Code. Bluetooth range has been further improved to 60ft by new hardware design, which gives full coverage of a regular size single-family house. Further improved heart rate reading algorithms. The heart rate can be accurately read out even the baby is wiggling around. The initial heart rate reading needs 2min. Better moisture resistance by new internal hardware improvement. This is especially important for the Diaper Mode.