The Speak Hole and Backer Transaction Window applies only interior applications, making it more economical for the budget-conscious. Framing options include: satin or dark bronze anodized aluminum, prime painted steel or stainless steel with a plastic laminate base and recessed cash tray. Available as counter mount or recessed stainless steel configuration. Voice transmission is via a 6” acrylic portal with a 10” oversized backer.