No need for cold oils or lotions again! This bottle warmer operates at a fixed temperature to warm up gels, lotions and oils. Just stick it in there, turn it on and come back without worrying about whether it will be too hot or too cold. Ideal Products' Stainless Economy Bottle Warmers are made of polished stainless steel with a low wattage heating sleeve. They are available for 1-4 8oz bottles.