70% of people choose a medium, Head circumference up to 23.5", Includes 30 sensors, Pairs with SleepMapper app
Frequently Asked Questions
Am I supposed to change the sensors on my SmartSleep every night?
The sensor which is placed behind your ear can be changed after 3 uses or more frequently if desired. The sensor on the frontal part of the headband should last for the life of the device, which is two years.