Home / G03 - Light Commercial / Residential / EV4-Qty-2. Stainless elevator single call button for bottom or top floor. 24 volt. two sizes, one is 10.5″ x 4.5″, and 10″ x 4″. EV4-Qty-2. Stainless elevator single call button for bottom or top floor. 24 volt. two sizes, one is 10.5″ x 4.5″, and 10″ x 4″.