The WMS40 Mini Single Instrumental Set is a true Plug 'n' Play wireless solution providing crystal clear audio sound The included PT40 Mini pocket transmitter provides a professional 3pin mini XLR connector, compatible with guitar and bass levels, headsets and instrumental mics. Its extremely long battery life of 30 hours off a single AA battery saves money in day-to-day use. The receiver comes in an ultra compact housing and offers a 1/4" jack output.