Description Discover Korea: Quality Finds, Delivered to Your Doorstep! Welcome to the warmest bed of your dreams Your nights will never be the same. Enjoy the comfort, warmth and a peace of mind with Navien Mate Cozy Sleep System. This innovative product acts as a heating bed sheet, with smart technology that heats up the flooring by boiling the water inside heating unit. It’s safe, it’s smart and it’s convenient. Alongside its many features, it is family friendly with specific child-safe mode – adding adjustment restrictions for your child.  Easily apply the ultra-slim King size mattress cover over your bed. Its 1mm slim design will never interfere with the performance of your mattress.   PRODUCT INSTALLATION: Plug the mattress topper hose to the heating unit until you hear a click. Power on the heating unit. Open the stopper and add purified and heated water. When the water level indicator shows full, put back the stopper on the unit and set your desired temperature.   PRODUCT FUNCTIONS: CHILD SAFE MODE DUAL TEMPERATURE CONTROL: PERSONALIZE YOUR TERMPERATURE PREFERENCE SELF-CHECK SYSTEM: EASILY CHECK THE STATUS OF YOUR SYSTEM WITH A CLICK OF A BUTTON STERILIZATION: DEVICE CLEANS ITS SELF WITH A CLICK OF A BUTTON TIMER LEAKING SENSOR: EASY DETECTION OF LEAKAGE WITH SMART SENSORS FIRE PREVENTION SYSTEM: PRODUCT RELIES ON WATER AS A HEAT SOURCE, WHICH ELIMINATES FIRE HAZARDS CAUSED BY ELECTRIC BLANKETS. ULTRA-SLIM MATTRESS COVER FDA STANDARD: PASSED PRIMARY SKIN IRRITATION TEST AND CYTOXICITY ACCESSMENT REVIEWED IN ACCORDANCE WITH THE PROVISION OF THE FDA GOOD LABORATORY PRACTIC REGULATIONS.