HO Diesel Sound Module with Wireless Controller : Early EMD. Add on-board sounds to a DC system! Many modelers would like a few on-board sounds on their DC system but without the added complexity and expense of a full-blown DCC system. This provides on-board sounds and installs in most DCC ready HO locos. Speed and direction is controlled with your normal DC power pack. Accessory sounds like horn and belll, are controlled with the wireless RF transmitter. Wireless control from any part of your layout. Package includes on-baord decoder modeule and wireless controller