This is in a used condition with signs of use. The sensor is slightly discoloured and a bit fluffy, the left sock in size 2 was the most used so the fabric is coming apart a bit and it is more discoloured than the rest. you will need a usb plug for the lead. You just download the owlet app on your device and it will take you through step by step how to connect it to your wifi. It monitors heart rate and oxygen levels to give you that piece of mind.
