The Beach Tek DXA-SLR PRO HDSLR Audio Adapter is designed to enhance audio quality with virtually any HDSLR camera by providing high quality XLR inputs, AGC disabling, built-in limiting, headphone monitoring, comprehensive metering & more. Connect up to two microphones & provide 12 or 48V phantom power to professional condenser microphones. Each channel features a gain control switch with 0 & 15d B settings, & the low-noise preamplifiers & throughput ensure pristine audio quality, wide frequency response & detail. The AGC (Automatic Gain Control) disabling feature eliminates audio level fluctuations that can ruin an otherwise good take. The unit is built tough, mounts to the base of HDSLR cameras, & its rear mounted VU meter displays level in 3 d B increments.