Bachmann 108 DMU. This is chipped but it's a Digitrax sound decoder that I have loaded with a 108 sound from the Digitrax sound group. I will be totally honest and say it's not the best sound in the world. but still better than running around a layout with no sound. It has a bass speaker fitted between the seats, and is quite loud. I have included the Digitrax paperwork so you know which cv's alter what, as you will prob want to adjust some to get it to run at it's best on your layout.Please bare in mind these Digitrax sound's are not the best,not like the Loksound or Zimo. (it was just me wanting to have a play around at my own sound) comes boxed.Happy bidding.