AV-Leader AVL620 Professional Water Resistant Headset Microphone for Shure Wireless Systems_ Great for aerobic & yoga classes! Please double check the MODEL NO. of your WIRELESS BODY PACK TRANSMITTER before you order. IPX-4 Waterproof Test Level Certified: Protected against splashing water - Water is sprayed at all angles at 10 liters/min at a pressure of 80-100kN/m2 for 5 min. Testing Video at YouTube: (1) http://www.youtube.com/watch?v=Inas-Uh97tI (2) http://www.youtube.com/watch?v=2pk3ZbFnvmk (3) http://www.youtube.com/watch?v=D29MW88CqmE Sweat and dust proof made for indoor and outdoor use. High quality voice/sound pickup Compatible with your own Shure transmitters: L1, L11, LX1, SC1, SLX1, U1, UC1, UT1, T1, ULX1, UR1, PGX. (NOT Compatible with Telex)