The Shure MX1BP is a battery-powered preamplifier and phantom power supply. The MX1BP features a 4-pin mini (TA4) connector for use with Shure Microflex and Easyflex gooseneck lavalier microphones as well as wireless lavalier, headworn, and instrument condenser microphone options. The preamplifier features a Mute switch and operates on 9V battery or phantom power. The cable measures 12 feet in length (3.66m).