This clip-on lavaliere mica provides crisp, full-sounding voice pickup and excels as an instrument mica, especially for pickup of acoustic guitar with included AT8444 guitar adapter. It offers excellent gain before feedback and suppression of background noise. An integral 80 Hz high-pass filter provides easy switching from a flat frequency response to a low-end roll-off. It operates on battery or phantom power. Audio-Technica AT831cW Wireless Lavaliere Microphone Features: Clip-on lavaliere mica also excels in acoustic guitar applications Provides crisp, full-sounding voice and instrument pickup Operates on battery or phantom power 6' (1.8 m) cable permanently attached to mica, TA3F connector at power module RoHS compliant - free from all substances specified in the EU directive on hazardous substances