This high quality, reliable heating pad is 60% larger than standard sizes. 12'' X 24'', it features 3 heat settings, with 'On' light indicator. Pair this with our digital timer for a perfect team. Use the first heat settings to incubate jars on top of pad and speed up colonization dramatically. Use the 2nd and 3rd settings for use on the bottom of your chamber to bring up moist warmth from your perlite, and help speed up growth and increase overall fruit body height.