DERBY Wool Fabric Electric Under Blanket, 30 x 60-inch/Single Bed (Multicolour) Usage : Bed Warmers DERBY electric under blanket specially design for Patients At Home Care ,Old Age persons ,HOSPITALS,SPAS,HOTELS AND RESORTS use. TO BE USED ONLY BELOW HEAD PORTION OF BODY. It comes with heat setting controller for Top And Foot Positions . Pre heat the blanket one hour before going to bed. A revolutionary way to sleep it's a NEW SLEEPING CONCEPT - Take a second to imagine to sleep on slightly heated surface in chilling winter. How relax you are going to feel ? - Most Convenient and economical way of keeping a person warm. Very Useful for Arthritics/Old age pains. With two temperature settings : Low/High(0-1-2)And two position settings.FOOT And TOP . - Two built in Thermal cut outs for 100% Safety. - Teflon Coated Wiring for protection against overheat. - Indicator for Clear Viewing. - Even Distribution of Heat. - Water Proof Element. - Long Lasting Heating element. - Well insulated on either side for complete safety and comfort. - Not to be Used by the patients with Pacemakers.