HF Transiever in the 40 meter wavelength capable of ccw transmissions. Headphone jack and little tapper switch on the side for sending little less than 1/2 watt output. Everything you need for international comms less power, headphones, antenna, experience and lisence. Antenna can be a length (rather long) of tripwire wound round the case for storage and strung in the trees for use. Headphone can be simple in-ear earphone. Power can be an altoids tin full of AA batteries. Fully equipped this station could fit in two altiods tins with some wire wound round the outside of both. Not too much of a burden for comms equipment capable of reaching the world.