The switch membrane (DE34-00439G) for your Samsung microwave allows for responsive and accurate touch commands. If your microwave's keypad is unresponsive, erratic, or not functioning as it should, it may be time to replace this component. This genuine Samsung part is designed to fit seamlessly with your 2.1 cu. ft. over-the-range microwave. Before purchasing, confirm your microwave's model number to guarantee compatibility.