Connect Systems Inc.'s FLEX-D Model 19 simplex repeater features up to 120 seconds of voice storage and two-tone validation. This controller stores the tones and voice in voice memory and rebroadcasts both on receipt of a valid two tone from an optional external two tone decoder. The standard simplex repeater version has up to 120 seconds of voice storage and stores voice in voice memory but regenerates up to two different two tones. This standard version and the Model 19 version are selectable by a jumper on the PCB.