Use With Heat SinkPlease Note That Each Thermoelectric Peltier Plate Cooler Must Be Used In Conjunction With A Heat Sink To Avoid Being Burned Mainly Used ToGet Ice Cold In Minutes Or Heat To L Boil Simply By Reversing The Polarity, Used For Many Cpu Cooler Applications For Alternate Power Sources, Or Even Your Own Custom Car Drink Warmer/Cooler No Moving PartsSince Thermoelectric Cooler Peltier Plate Consist Mainly Of Semiconductor Material Sandwiched Between Ceramic Plates And Have No Moving Parts Quality GuaranteeEach Peltier Plate Thermoelectric Cooler Is Full Inspected And Tested Before Selling, And Each Equipped Mining Insulated Excellent After-Sales ServiceExcept The Premium Product We Offer, We Provide Also Considerate After-Sales Service. Please Contact Us For Any Problem On Our Product. It Is Our Pleasure Service To You