The Base Station is designed to notify you using a few different colors and sounds.
Bouncing Green:
Looking for readings from your baby.
Pulsing Green:
Receiving readings.
Flashing Blue:
Sock out of range from Base Station, depleted battery or signal blocked.
Flashing Yellow:
Sock has fallen off or is improperly placed.
Flashing Red:
Heart rate or oxygen level are outside specified limits.
Blinking Orange:
The Sock was placed on a Base Station it is not paired to.
White:
Sock is plugged in and charging.
Bouncing White:
Sock is not paired to Base Station.