When the frame stays at " Heat " function it will start thermal therapy solely. The digital figure showing time on the screen will start countdown 15 minutes. When the frame stays at both " Mode " and " Heat " functions, it will start treatment and thermal moxibustion at the same time and the intensity figure will flash continuously. Then you can shoose the intensity by pressing button " + " or " - ". In this status, press button "M/I", the figure at the left down corner will flash and you can press button "+ " or "-" to choose 1-9 pattern