The handles on the MM540, MM700, MM750 and the sensor on the MM815 come with heat sensitive protection! At 110-degress they turn bright red, letting you know the temperature has become too hot for your TV and that you should bring it to the raised position and/or turn off your fireplace.NOTE: Please note that we don’t suggest your TV be in the lowered position when your fireplace is turned on.NOTE: While the MM340 has pull-down handles for your convenience, they are not heat sensitive.