750 Millivolt Replacement Thermopile Generators have long been used in self-powered heaters and hot water equipment. <br> It has been proven in millions of appliances as the contractor's preferred thermopile and are found in many of today's self powered gas fireplaces.<br> Working Instructions:<br> 1). Keep the thermopile heated in the 1/3 of the head location, Don't heat the back place to heater brass sleeve.<br> 2). Because of High Resistance inside, The thermopile need around 1-2 minutes to be heated and increase to at least 750mV ( our reset voltage is around 800-900mV) <br> 3) Do not take it off untill you heated it around 2 minutes <br> 4) Do not bend the fireplace thermopile too hard on the crimped part and inside wires or it may cause short circuit and low voltage problem<br> 5) If any problem, please contact us for customer service.