The TechYidCo. Shabbos Safe Warming Tray's patented design allows the end user a safe, dependable and durable way to keep their food warm on Shabbos and Yom Tov. It was designed by a frum Electronic Engineering Technician with safety and Halachic compliance first in mind. By placing the Stainless Steel Heating Element on the bottom panel of the chassis, causing all heat transfer to radiate upward through a blanket of air, the patented design mimics the traditional Jewish blech. This design allows your food to be warmed in a Hallachically kosher and safe way. The Warming Tray is ETL Safety Certified and designed with over 5 individual safety features. TechYidCo. Is dedicated to providing Hallachically certified and Safe appliances. We specialize in keeping your family safe so that you can truly rest on Shabbos!