The wireless body-pack standard gets even better. Sennheiser has packed many useful features in the 158g weight of the SK 100 G3. The SK 100 G3 has an easy-to-read graphic display, infrared sync, charging contacts, cable emulation, RF mute, an intuitive menu and much more. As features alone are no substitute for audio quality, the AF frequency response was expanded to 25-18,000 Hz for the truest sound.