I have an original Ace Nautical commander on 75 Mhz (Channel 72) with Dual throttle control for sale! It is in excellent condition and has spent its life in one boat. It has new nicads and comes with original charger. The unit also has a channel expander installed if you would like to add additional functions to your submarine such as operating guns, lights, diesel sounds, etc. I will throw the expander in with the deal. The channel expander itself retailed for well over $150.00 installed. Comes in original Ace box. $450 or best offer.