The Lectrosonics MI39AST 30" Active Instrument Cable is used with all transmitters, including IM, LM, UM400, SM Series, SMa Series, LMa and UM400a models. The Passive design for use with very high output instrument pickups such as electric bass guitars with 18 volt systems and designed for musicians who demand rugged, high quality equipment and the best sound quality available. It features 1/4" Straight Phone Plug to TA5F Connector.