The LokSound 5 Micro DCC-MM-SX-M4 Multi-Prototcol Sound and Control Decoder by ESU is by far the smallest LokSound decoder. Measuring only 13/16 x 13/32" 21 x 10mm it should fit into all N gauge and TT locomotives and is also suitable for small HO locos too. All LokSound decoders are equipped with a Next18 interface and are available with adapter plugs to suit all popular digital interface types. The decoder is supplied with a 7/16 x 19/32" 11 x 15mm sugar cube speaker and sound enclosure set.