When you turn off the DreamStation, the display is very bright. The Black Out Curtain covers the display preventing the light from disrupting the darkness in your bedroom. When you turn the DreamStation off whether it is in the middle of the night or when you get up in the morning this keeps the light from disturbing a sleeping partner. If it is in the middle of the night, it may make it easier to get back to sleep.
 It is thin material and does not interfere with the machine functions. It is easy to slide it out of the way if you need to see the data from the screen at anytime. It will not fall off the machine because it fits over the hose connection of the machine. Hand washable if necessary, this is very durable material and will last a long long time. Available in Black only.