The K6 powering module is a heart of Sennheiser's modular microphone system that can be powered by an internal AA battery or phantom power. It can be combined with different microphone heads to provide various polar patterns. Key features include a switchable bass roll-off filter, on/off switch with battery test, and balanced output on an XLR connector. It is compatible with ME 62-67 microphone heads and MKE 2-60 clip-on microphone.