Owlet SS3/MINT GREENThe award winning Smart Sock 3 is the 3rd generation monitor that tracks the most important indicators of your babys well being so while they rest easy, you can, too. the small electronic sensor, attached to your baby's foot via a 'sock' uses pulse oximetry to measure your baby's pulse and oxygen levels if the readings fall outside of the preset levels an alarm will alert you via the base station you can also download the Owlet app and get