i found a site that lists info on digi q models. i found that the 4 button controller was designed for the digi q submirine and not he combat series. That should answer you questions on the controller issue. i have to know this stuff because i am a dealler here in hawaii on oahu. i sell most of the bitchargers and the new wild series and also sell digi q's and the digi q tank and the digi q submirine.