4 x High-Gain XLR Mic Inputs with +48V 4 x Independent Headphone Outputs 4 x Sound Pads for Music and Samples Simultaneous TRRS & USB Call-Ins Mix-Minus for Echo-Free Remote Call-Ins Built-In Limiters and Low-Cut Filters Separate Gain, Mute & Headphone Volume Powered via Batteries, AC, or USB Supports SDXC Cards up to 512GB Class-Compliant Mode for iOS Devices