How to Use: Heat Therapy: * Clean the microwave carousel firstly to remove any oil or food residue. *Then put on a clean, dry plate on the microwave carousel, and place the rice bags for heat therapy microwavable flat on the plate. * Microwave the back heat patch for 120 sec the very first time. (For non-carousel microwaves, microwave the product for 60 sec the very first time, then rotate it 180° and microwave it another 60 sec). * Light touch the heat wraps for back pain before use. If not hot enough, increase the next heating cycle by 30 sec (Be patient, do not increase the heating time by more than 30 sec). Expect 20 min heat therapy *DO NOT OVER HEAT!! Cold Therapy: *Leave the microwave heat packs in the freezer for 4 hours. Expect 10 min cold therapy. You can put your wrap back into the freezer any time.