Mite Away Quick Strips are a formic acid application product for killing Varroa mites on the bees as well as the reproducing mites under the brood cap.  Keep the bottom entrance open the full width of the hive.  Screend bottom boards may be left open when used along with top entrances.  Treatment duration is for 7 days with daytime temperatures are between 50 and 92 degrees Farenheit.