The AKG WMS45 Perception Headset Wireless Sports system with its comfortable C544L and ultralightweight PT 45 bodypack transmitter ensures maximum user mobility for all handsfree applications. The C544L headworn microphone comes with four moisture shields protecting the transducer from perspiration while you practice your favorite sport. The C544L uses the proven transducer of the C555L and is quick and easy to put on and replace.