Wideband frequency multiswitch: 250-750 Mhz, 950-1450 Mhz, 1650-2150 Mhz To be used with AT9 or AU9-S Ka/Ku DIRECTV satellite dishes Dimensions: 3 7/8 x 7 3/4 No external power required - power to operate switch is derived from the receiver Multiswitch is passive, powered only by the connected satellite receivers.