The Eye Doctor Click and GO® is a REUSABLE instant hot eye compress that does not require an oven or microwave to heat up. Designed to be used anywhere, instantly. The Eye Doctor Click & GO® is activated by simply clicking the disk inside the compress to generate the heat required for an effective treatment staying warm for over 20 minutes. Following activation and treatment the mask will be required to be reset to its previous state by placing in boiling water. The Eye Doctor Click and GO® can also be used cold, use directly from the fridge. Single unit.