I bought a heating pad for Cindy that you warm in the microwave, but you have to do it by wattage of the microwave. I've looked in the manual and on the microwave itself, and I don't see any indication of what that might be. It is a GE and very old (like 20 years - it came with the house). I'd really like to try it for Cindy, but they're very cautionary about making sure you only heat it the exact time on the list by wattage. I tried to search on the GE site, but it doesn't come up with this model number. Any ideas?