Mine worked perfectly, was just curious to see if it was possible to change its working frequency (to have two M16s running at a time) and if there was any room for improvements (such as adding the engine sound or a battlesystem of some sort). El-mod has had a 'work in progress' unit for half tracks for some months, and maybe some day they could finish it. EVen SGS-elektronik has a full option unit for half tracks.