We're specialized in manufacturing the waterbed heater in electronic type. We supply two kinds of spec.: 110 V(PTW-300A) and 220 V(PTW-300B), with power 300 W.   HEATING PAD: It is with double-insulation system: The inside is made of polyester while the outside is covered by a special PVC which is for heating use only. There's a thermostat to cut the power automatically when the temperature is too high. In addition, a metal membrane of heat-conduction is adhered to the surface of heating pad. These devices make it pretty safe and durable.     CONTROL BOX: It is using an IC element which can control the waterbed temperature precisely at between 21¢Jand 38¢Jwith the deviation(plus, minus) 1°C only. Another feature is that the SEE(Static Electricity Eliminator) device is included which make it much safer. We're proud to say that our waterbed heater is the best among all which is suitable for different types of waterbeds.