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High quality, 3.5mm mono (2-conductor) plug. Has a black plastic sleeve with flexible cable strain relief. These are the small (1/8") diameter plugs commonly used for audio connections as well as straight key inputs to many modern rigs. The PicoKeyer-Plus and MasterKeyer also use this plug for keying output, and it can be used for an active-LOW input to a more recent UKA-2 or UKA-3+.