The Rolls MX310 is a 3-channel mono microphone mixer, offering individually switchable phantom power and individually switchable low cut filters for each channel. The MX310 also features a 3.5mm (1/8″) headphone output jack for monitoring. The MX310 is built in an all-metal chassis and weighs 1 pound. Overall dimension are 5.25″ X 3.75″ X 1.5″. Bottom mounts are provided for permanent installations. The MX310 ships with an included 12 VDC external power supply. The output XLR of the MX310 is switchable for mic or line level output to make the MX31 match up to almost any application.