The Xantech Designer Emitter Shield is a black (IR Opaque) 1" by 2" shield that fits over both the Xantech designer emitter body and the IR sensor window of a controlled component. An optional accessory, it prevents unwanted external IR signals from passing through it or leaking past it. The Xantech Designer Emitter Shield also prevents IR signal from the designer emitter from radiating backwards into the IR sensors of other components. It is especially useful for zone-controlled applications where you want the equipment controlled only by the designer emitter fastened over the component IR sensors. Also known as -28DES Shield Cover-Xantech 28DES Shield Cover - For Mouse Emitter-XANTECH 28DES Designer Emitter Shield