DeW It Right Tap Mics. 
Two omnidirectional condenser lavalier microphones 
with one connector, with full range sound, made specifically for tap dancing.
SPL max - 120db
Impedance - 1600Ohm
Sensivity - -63db
Response 30>20k
(TA4F connector made for SHURE) 
***** Please note a Wireless Transmitter and Reciever System is needed to operate your microphones********