This is an original UHF Radio ARC-27 Airborne Transceiver Local Channel Selector  C-626/ARC-27. This unit was in the back of the aircraft and was used to store 20 preset frequency channels that could be selected by the pilot on his UHF radio console box type C-628/ ARC-27. The ARC-27 was the first aircraft UHF radio.  It is 7  x 7 x 6 inches. This item is being sold as a collectible. Payment should be received within 10 days of auction closing unless prior arrangements have been made. Buyer to pay actual shipping. AZ residents add 6.7% sales tax. Thanks for looking at my auction.