9v Battery & Phantom Power. Two Mini XLR Male Inputs. One XLR Male Output. Volume Controls. Earphone Output to Monitor Microphone SignalsVoltage: 9v Battery/12-48V PPhantom Power Dimensions: 92 x 23 x 65mm. The PS-510M is developed based on PS-500. The PS-510M provide both 9V battery power and phantom power. It is built with earphone output for musician to monitor a preferred mix of two microphone signals before goes to PA.