?WASHABLE?The heated compress can be easily removed from the eye mask’s exterior cover, allowing you to clean it easily. Eye Mask Must be plugged in your own USB outlet to operate, external USB charger is NOT included. ?PORTABLE & ECO-FRIENDLY?Easily powered it by power bank, USB wall adapter, laptop. You can travel with it everything using the included carrying case. It is also much more economical than the disposable one-time steaming eye mask. ?SOFT & SAFE?Internal of the eye mask is compose with soft and fluffy materials, allowing only the softest and most gentle touch to your eyes. Unlike traditional microwave eye mask, this eye mask has been heavily tested during development to prevent the possibility of over-heating damage. ?TEMPERATURE & TIME CONTROL?The mask is designed with 5 level of heat and time setting, ranging from 35 to 50 °C ( 95 to 122 °F ), and 10 to 30 minutes respectively, allowing the mask to automatically turn off as you go asleep. ?HOT or COLD?With the included Ice Gel, along with the heated carbon fiber compress, you can choose your desire temperature ranging from icing cold to steaming heat.