Clip on sax microphone. Trumpet/trombone, etc. 
Locking jack version for use with Trantec/Sennheiser/Pulse wireless bodypacks. 
They sound great!
Nice warm 'bottom end' with detailed mid and high. 
Complete with foam windshield (which does help soundwise)
 
Pre-Owned but excellent/very good condition. 
Fully tested/working.